Ancient Civilizations
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Mesopotamian Civilization - The Sumerians and Cuneiform
c. 3500 BCE~ (Archaeological estimate)
What happened
Between the Tigris and Euphrates rivers, the Sumerians founded city-states and created cuneiform, humanity's first writing system.
Why it matters
One of the earliest cradles of civilization, where many foundations of later human civilization β writing, law codes, and the city-state β first appeared.
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Code of Hammurabi
c. 1750 BCE (Documented record)
What happened
King Hammurabi of Babylonia proclaimed a written law code of 282 provisions, famous for the principle of 'an eye for an eye, a tooth for a tooth.'
Why it matters
One of the oldest surviving written law codes; it applied different punishments by social rank and is an important source for understanding the social order of its time.
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Egyptian Civilization - Pharaohs and Pyramids
c. 3100 BCE~ (Archaeological estimate)
What happened
A unified kingdom formed along the Nile, establishing a theocratic state centered on the pharaoh and leaving behind massive pyramids and hieroglyphic writing.
Why it matters
An ancient civilization that lasted more than 3,000 years and greatly influenced later civilizations in astronomy, architecture, medicine, and more.
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Indus Valley Civilization
c. 2500 BCE (Archaeological estimate)
What happened
In the Indus River basin of present-day Pakistan and northwestern India, a civilization with planned cities such as Mohenjo-daro and Harappa flourished.
Why it matters
Famous for planned cities with sophisticated water supply and drainage systems, but its script has never been fully deciphered, leaving much of it a mystery.
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Yellow River Civilization - Rise of the Shang Dynasty
c. 1600 BCE (Archaeological estimate)
What happened
In the Yellow River basin, the Shang (Yin) dynasty, which used oracle bone script, arose and opened China's first historical era.
Why it matters
Oracle bone script, the ancestor of Chinese characters, was used in this period, which is regarded as the start of written records in Chinese civilization.
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The Hebrews and the Formation of Monotheism
c. 2000β1000 BCE (Scholarly consensus)
What happened
In ancient Palestine, the Hebrew (Israelite) people formed a religious tradition of belief in one God, which became the root of today's Judaism.
Why it matters
This monotheistic tradition became the intellectual root of Christianity and Islam, forming the common origin of the world's three major monotheistic religions.
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Formation of the Greek Polis and Athenian Democracy
8thβ5th century BCE (Scholarly consensus)
What happened
Independent city-states (poleis) such as Athens and Sparta formed in the Greek Mediterranean, and Athens developed a democracy in which citizens took part directly in politics.
Why it matters
The place where the political system that gave us the word 'democracy' was first tried, regarded as the root of Western political thought.
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The Persian Wars
492β449 BCE (Documented record)
What happened
The vast Persian Empire invaded Greece, but the allied Greeks won victories at the Battle of Marathon (490 BCE) and the Battle of Salamis (480 BCE), among others.
Why it matters
An alliance of small city-states defeated a great empire, which let Athens take the lead in the Greek world and enter its cultural golden age.
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Alexander the Great's Eastern Campaign and the Hellenistic Age
334β323 BCE (Documented record)
What happened
Alexander the Great of Macedon toppled the Persian Empire and advanced as far as northwestern India, giving rise to Hellenistic culture, a fusion of Greek and Near Eastern cultures.
Why it matters
He built an empire spanning Europe, Asia, and Africa that fostered exchange between East and West, and Hellenistic culture went on to strongly shape Roman culture.
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Founding of the Roman Republic
509 BCE (traditional) (Traditional/legendary date)
What happened
According to tradition, the Romans expelled their kings and established a republic centered on the Senate and consuls, after which various institutions expanding the rights of the plebeians developed.
Why it matters
The prototype of a political system that influenced the republics and parliaments of many later Western states; the word 'republic' comes from 'res publica' (the public thing).
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The Punic Wars - Rome Takes Control of the Mediterranean
264β146 BCE (Documented record)
What happened
Rome and Carthage in North Africa fought three wars for dominance of the Mediterranean; Rome won in the end and completely destroyed Carthage.
Why it matters
Victory gave Rome mastery of the entire Mediterranean world and laid the foundation for its growth into a great empire.
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Beginning of the Roman Empire - Augustus
27 BCE (Documented record)
What happened
Octavian received the title 'Augustus' from the Senate and began to rule effectively as emperor, ending the Republic and opening the imperial era.
Why it matters
It began the roughly 200-year 'Roman Peace' (Pax Romana), during which the entire Mediterranean world prospered under a single unified order.
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Qin Unification of China
221 BCE (Documented record)
What happened
King Zheng of Qin (later Qin Shi Huang) unified a China divided among many states for the first time, standardized writing, weights and measures, and currency, and built the Great Wall.
Why it matters
The founding of China's first unified empire; a leading theory holds that the Western name 'China' itself derives from 'Qin.'
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Founding of the Han Dynasty and the Opening of the Silk Road
202 BCE~ (Documented record)
What happened
After the fall of Qin, Liu Bang founded the Han dynasty; under Emperor Wu, Zhang Qian was sent to the Western Regions, opening the Silk Road trade route linking China with West Asia and Europe.
Why it matters
A trade route between Eastern and Western civilizations opened, carrying not only silk and spices but also religions and ideas, and served as the great artery of EastβWest exchange for centuries.
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Jesus Christ and the Rise of Christianity
c. 1st century CE (Scholarly consensus)
What happened
In Palestine, Christianity began from belief in the ministry, death, and resurrection of Jesus, and spread rapidly throughout the Roman Empire.
Why it matters
It grew into the religion with the most followers in the world and deeply influenced the thought, ethics, and culture of Western civilization.
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Rome Legalizes Christianity - The Edict of Milan
313 CE (Documented record)
What happened
Roman Emperor Constantine I issued the Edict of Milan granting freedom of Christian worship, and under Emperor Theodosius (392) Christianity became the state religion.
Why it matters
Christianity, once a persecuted minority religion, gained official recognition from the Roman Empire β a decisive turning point for its spread across Europe.
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India's Maurya Dynasty - Ashoka Spreads Buddhism
3rd century BCE (Documented record)
What happened
King Ashoka of the Maurya dynasty, India's first unified empire, repented the horrors of his wars of conquest, converted to Buddhism, and pursued policies to spread it widely.
Why it matters
With Ashoka's patronage, Buddhism began spreading beyond India to Sri Lanka, Southeast Asia, and Central Asia.
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Division of the Roman Empire and Fall of the Western Roman Empire
Divided 395, Western Empire fell 476 (Documented record)
What happened
After the Roman Empire split into East and West (395), the Western Roman Empire, amid continual Germanic invasions, was finally overthrown by the Germanic mercenary leader Odoacer (476).
Why it matters
Regarded as the classic dividing line between antiquity and the Middle Ages in Western history; Western Europe then fragmented into Germanic kingdoms, while the Eastern Roman (Byzantine) Empire survived for nearly another thousand years.
Middle Ages
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Founding of Islam - Muhammad
610β632 (Documented record)
What happened
Muhammad of the Arabian Peninsula founded Islam, reporting that he had received revelations from the one God, Allah; the year of his migration from Mecca to Medina in 622 (the Hijra) marks the start of the Islamic calendar.
Why it matters
The starting point of Islam, which grew into one of the world's three major religions and, with the rapid expansion of the Islamic empire, profoundly shaped world history.
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Rapid Expansion of the Islamic Empire
7thβ8th century (Documented record)
What happened
After Muhammad's death, Islamic forces expanded rapidly beyond Arabia to North Africa, the Iberian Peninsula, and Central Asia in a short time.
Why it matters
It preserved and developed ancient Greek and Roman learning and served as a bridge transmitting it to Europe; the geographic framework of the Islamic world that endures today took shape at this time.
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Coronation of Charlemagne
800 (Documented record)
What happened
Charlemagne of the Frankish kingdom was crowned Emperor of the Romans by the Pope, reviving the Roman imperial title in Western Europe.
Why it matters
A symbol of the political and religious unity of Western Christendom, and a sign of the height of the Frankish kingdom, the origin of today's France and Germany.
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Emergence of Feudalism
9thβ10th century (Scholarly consensus)
What happened
As central royal power weakened and foreign invasions grew frequent, feudalism β kings granting land to lords in return for loyalty and military service β took hold across Western Europe.
Why it matters
The defining political and economic order of medieval Western Europe, forming the backbone of European society until royal power was strengthened again in the early modern period.
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Height of the Byzantine Empire - Justinian
6th century (Documented record)
What happened
Emperor Justinian of the Eastern Roman (Byzantine) Empire compiled Roman law into the Code of Justinian and recovered part of the former Roman territory.
Why it matters
Even after the fall of the West, the Byzantine Empire survived until 1453, preserving Greco-Roman culture and Greek Orthodoxy and passing them on to later ages.
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Song Unification of China
960 (Documented record)
What happened
After the chaos following the fall of the Tang (the Five Dynasties and Ten Kingdoms), Zhao Kuangyin founded the Song dynasty and reunified China; civil governance through the examination system, commerce, and a money economy flourished.
Why it matters
A period when China's great inventions β gunpowder, the compass, and printing β advanced greatly; these technologies later spread to Europe via the Islamic world and had a major impact on world history.
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The Crusades
1096β1291 (Documented record)
What happened
At the Pope's call, European Christian forces launched eight expeditions against the Islamic world in the name of recovering Jerusalem and the Holy Land.
Why it matters
Beyond the religious cause, feudal lords also sought to expand their power; though the Crusades ultimately failed, they stimulated EastβWest exchange and brought new goods and learning to Europe.
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Rise of the Mongol Empire - Genghis Khan
1206 (Documented record)
What happened
TemΓΌjin united the tribes of the Mongolian steppe and was proclaimed Genghis Khan, going on to build the largest contiguous empire in human history across Eurasia.
Why it matters
Through an empire stretching from East Asia to Eastern Europe, EastβWest trade and cultural exchange became unprecedentedly active; this period is sometimes called the 'Mongol Peace' (Pax Mongolica).
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Yuan Rule over China
1271β1368 (Documented record)
What happened
Kublai Khan adopted the Chinese-style dynastic name 'Yuan,' destroyed the Southern Song, and ruled all of China; Westerners such as Marco Polo also traveled there frequently.
Why it matters
An example of a foreign dynasty founded by the Mongols ruling China; Korea's Goryeo dynasty also came under Yuan interference at this time as a son-in-law state.
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Magna Carta (the Great Charter)
1215 (Documented record)
What happened
English barons, resisting King John's arbitrary taxation and abuse of power, forced him to put his seal to a document limiting royal authority.
Why it matters
The first document to set down the principle that even the king is not above the law, becoming a cornerstone of English parliamentary government and constitutional monarchy.
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The Hundred Years' War
1337β1453 (Documented record)
What happened
A war of more than a century between England and France over royal succession, which France ultimately won, helped by the exploits of Joan of Arc.
Why it matters
Through this war both England and France developed stronger national identities, and the decline of the feudal knightly class pushed both toward centralized monarchy.
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The Black Death (Plague)
1347β1351 (Documented record)
What happened
The Black Death, which began in Central Asia and spread across Europe along the Silk Road and trade routes, killed nearly a third of Europe's population.
Why it matters
The sudden population drop created labor shortages that shook serfdom and raised wages, contributing greatly to the collapse of the medieval feudal order.
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Founding of the Ming Dynasty
1368 (Documented record)
What happened
Zhu Yuanzhang drove the Mongol Yuan dynasty north and founded the Han Chinese Ming dynasty, reunifying China.
Why it matters
Han Chinese rule over China was restored, and for a time the Ming was also a powerful maritime force, as in Zheng He's great voyages (early 15th century).
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Ottoman Conquest of Constantinople
1453 (Documented record)
What happened
Mehmed II of the Ottoman Empire captured Constantinople, capital of the Byzantine Empire, bringing the Eastern Roman Empire, which had lasted more than a thousand years, to a complete end.
Why it matters
Regarded as one of the classic events marking the end of the Middle Ages in Western history; Constantinople (Istanbul) then became the Ottoman capital.
Early Modern Era (RenaissanceβEnlightenment)
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Beginning of the Renaissance - Italy
14th century~ (Scholarly consensus)
What happened
Centered on the Italian city-states, a cultural revival movement sought to restore the humanist culture of ancient Greece and Rome, bringing innovation to art, literature, and architecture.
Why it matters
Regarded as the intellectual turning point from a God-centered medieval worldview toward modern, human-centered thinking.
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Gutenberg's Movable-Type Printing Press
c. 1450 (Documented record)
What happened
Johannes Gutenberg in Germany invented movable-type printing, making it possible to mass-print books, including the Bible.
Why it matters
Knowledge and information ceased to be the monopoly of a few clergy and nobles and spread widely, which later strongly influenced the Reformation, the Scientific Revolution, and the spread of the Enlightenment.
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Columbus's Voyage to the Americas
1492 (Documented record)
What happened
Sponsored by the Spanish crown, Columbus set out to find India by sailing west and instead reached the American continents.
Why it matters
It launched Europe's full-scale expansion into the Americas, but it was also the starting point of a tragedy: the rapid destruction of Indigenous American civilizations and the beginning of the African slave trade.
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Opening of New Sea Routes - Vasco da Gama and Magellan
1498; 1519β1522 (Documented record)
What happened
Portugal's Vasco da Gama opened a sea route to India around Africa (1498), and Magellan's fleet completed the first circumnavigation of the globe (1522).
Why it matters
Sea routes for direct European trade with Asia and the Americas opened, after which the worldwide expansion of the European powers (the Age of Discovery) began in earnest.
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Colonization of the Americas and the Atlantic Slave Trade
16thβ19th century (Scholarly consensus)
What happened
As European powers built colonies in the Americas, Indigenous populations plummeted, and to fill labor shortages a slave trade forcibly carried millions of Africans to the Americas.
Why it matters
The largest forced migration and human rights atrocity in human history β a tragedy that has left a deep mark on American and African societies to this day.
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Founding of the Qing Dynasty and Its Rule over China
1636/1644 (Documented record)
What happened
The Later Jin, founded by the Manchus, renamed itself Qing (1636), and when the Ming collapsed from internal rebellion, the Qing took Beijing and came to rule all of China (1644).
Why it matters
The last foreign dynasty, in which the minority Manchus ruled the Han majority; the Qing's war against Korea (the Qing invasion of Joseon, 1636) also directly affected Joseon.
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The Thirty Years' War and the Peace of Westphalia
1618β1648 (Documented record)
What happened
Beginning as a religious conflict between Protestants and Catholics, it became a massive war entangling all the European powers and ended with the Peace of Westphalia.
Why it matters
The treaty is credited with establishing the prototype of the modern international order based on mutual respect for state sovereignty (the sovereign-state system).
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Establishment of Absolute Monarchy - Louis XIV of France
17th century (Documented record)
What happened
Louis XIV of France wielded powerful royal authority, epitomized by the phrase 'I am the State,' and embodied absolute monarchy centered on the Palace of Versailles.
Why it matters
Many European countries established absolute monarchies through stronger royal power in this period β the very system later civil revolutions sought to overthrow.
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England's Puritan Revolution and Glorious Revolution
1642β1649; 1688 (Documented record)
What happened
Following the Puritan Revolution, in which Parliamentarians executed King Charles I (1649), the Glorious Revolution (1688) had new monarchs accept the Bill of Rights from Parliament, establishing the framework of constitutional monarchy.
Why it matters
The bloodless Glorious Revolution became a model of constitutional monarchy with royal power under parliamentary control, influencing the political development of many countries.
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The Scientific Revolution - Copernicus, Galileo, Newton
16thβ17th century (Documented record)
What happened
Through Copernicus's heliocentric theory, Galileo's telescopic observations, and Newton's law of universal gravitation, a modern scientific way of thinking based on observation and experiment took hold.
Why it matters
Modern thinking that explores natural laws through reason, rather than through a theological worldview, took root and became the intellectual foundation of the Enlightenment and the Industrial Revolution.
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Spread of Enlightenment Thought
18th century (Scholarly consensus)
What happened
Thinkers such as Locke, Montesquieu, and Rousseau developed Enlightenment ideas emphasizing reason, human rights, and the social contract, greatly influencing European intellectual society.
Why it matters
Concepts such as natural rights, separation of powers, and the social contract took shape and became the intellectual basis of modern civil revolutions such as the American and French Revolutions.
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Height of the Ottoman Empire - Suleiman I
16th century (Documented record)
What happened
Under Suleiman I, the Ottoman Empire reached its peak, securing its largest territory across Eastern Europe, the Middle East, and North Africa.
Why it matters
As a mighty Islamic empire spanning Europe, Asia, and Africa, it competed with the European powers for a long period and greatly influenced international affairs.
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Founding of the Mughal Empire
1526 (Documented record)
What happened
Babur, from Central Asia, conquered northern India and founded the Mughal Empire, which grew into a great empire ruling most of the Indian subcontinent.
Why it matters
A period when an Islamic dynasty ruled Hindu-majority India and a distinctive Indo-Islamic culture (such as the Taj Mahal) flourished.
Modern Era (Civil RevolutionsβImperialism)
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The American Revolution
1775β1783 (Documented record)
What happened
Opposing British tax policy, the thirteen North American colonies declared independence (1776) and, after winning the war, founded the United States of America.
Why it matters
The Declaration of Independence, proclaiming natural rights and popular sovereignty, greatly influenced the development of democracy worldwide, including the French Revolution.
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The French Revolution
1789 (Documented record)
What happened
Amid a fiscal crisis and the contradictions of the estate system, Parisians stormed the Bastille, launching the revolution; the Declaration of the Rights of Man and of the Citizen was adopted and absolute monarchy was overthrown.
Why it matters
Proclaiming liberty, equality, and fraternity, it established the principles of modern civil society β a world-historical turning point that spread revolutionary and democratic ideals across Europe.
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Rise of Napoleon and His Wars of Conquest in Europe
1799β1815 (Documented record)
What happened
Napoleon seized power in a coup, crowned himself emperor, and conquered most of Europe, but after his failed Russian campaign he fell and was finally defeated at the Battle of Waterloo (1815).
Why it matters
Through the Napoleonic Code he spread the ideals of the French Revolution (such as equality before the law) across Europe, and in the process stirred national consciousness in many countries.
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Establishment of the Vienna System
1815 (Documented record)
What happened
After the Napoleonic Wars, the European powers held the Congress of Vienna to restore the pre-revolutionary order (monarchy) and set up a conservative international order based on a balance of power.
Why it matters
It tried to suppress liberal and nationalist movements but eventually collapsed with the Revolutions of 1848 and others, becoming one stage in Europe's move toward the modern nation-state system.
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The Industrial Revolution
Late 18thβ19th century (Scholarly consensus)
What happened
In Britain, inventions such as the steam engine and spinning machines shifted production from handicrafts to machine production in factories, and this change spread to Europe and around the world.
Why it matters
A great transformation that fundamentally changed how humans produce and live, bringing urbanization and the growth of capitalism along with the formation of a working class and new social problems.
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Latin American Independence Movements
1810sβ1820s (Documented record)
What happened
Led by figures such as SimΓ³n BolΓvar, many Latin American countries that had been Spanish and Portuguese colonies won independence one after another.
Why it matters
It freed most of the Americas from European colonial rule and shows how the ideals of the French Revolution and American independence spread across the world.
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The Opium War
1840β1842 (Documented record)
What happened
Britain, opposing the Qing crackdown on opium, went to war and won; through the Treaty of Nanjing it received Hong Kong and forced the Qing to open its ports.
Why it matters
The Qing, once East Asia's greatest power, submitted to Western powers by force β the starting point of modern China's century of hardship as it sank into a semi-colonial state.
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The Revolutions of 1848 in Europe
1848 (Documented record)
What happened
Beginning with the February Revolution in France, revolutions demanding liberalism and nationalism spread throughout Europe, including Germany and Austria.
Why it matters
Most were suppressed quickly, but they sparked the full-scale liberal reforms and national unification movements that followed in many European countries.
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The American Civil War and the Abolition of Slavery
1861β1865 (Documented record)
What happened
Conflict over the expansion of slavery led the American South and North to war; the North, led by Lincoln, won, and the Emancipation Proclamation (1863) was realized.
Why it matters
The deadliest war in American history, it led to the abolition of slavery and preserved the unity of the Union.
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Unification of Italy
1861 (Documented record)
What happened
Centered on the Kingdom of Sardinia, Cavour's diplomacy and Garibaldi's expedition combined to unify the divided Italian peninsula into a single kingdom.
Why it matters
Long-divided Italy was integrated into a modern nation-state β together with German unification around the same time, a signature achievement of European nationalism.
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Unification of Germany
1871 (Documented record)
What happened
Prussian Minister-President Bismarck, through his 'blood and iron' policy, won successive wars against Austria and France and united the German states into the German Empire.
Why it matters
The emergence of a powerful unified Germany in the heart of Europe greatly changed the European balance of power, later becoming one of the backgrounds of World War I.
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The Meiji Restoration
1868 (Documented record)
What happened
Japan overthrew the shogunate and transformed into a modern centralized state under the emperor, pursuing modernization by actively adopting Western institutions and technology.
Why it matters
The fastest successful modernization and industrialization in Asia; it later became the background for Japan joining the imperialist powers and encroaching on Korea and other Asian countries.
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Imperialism and the Partition of Africa
1880sβ1914 (Scholarly consensus)
What happened
Needing raw materials and markets after the Industrial Revolution, the European powers divided and colonized most of the African continent following the Berlin Conference (1884β85).
Why it matters
Artificial borders drawn at this time, ignoring ethnic and tribal boundaries, remain a source of internal conflict in many African countries today.
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Marx and the Rise of Communist Thought
1848 (Documented record)
What happened
Karl Marx and Friedrich Engels published The Communist Manifesto, criticizing the capitalist system and calling for a working-class revolution.
Why it matters
It became the intellectual root of many 20th-century socialist and communist movements, including the Russian Revolution, and the starting point of the ideological rivalry that split the world during the Cold War.
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Darwin's Theory of Evolution
1859 (Documented record)
What happened
Charles Darwin published On the Origin of Species, presenting the theory of biological evolution by natural selection.
Why it matters
It sent shockwaves through not only biology but also religion, philosophy, and social thought, and was later distorted and misused to justify imperialism and racism.
Early 20th Century (World WarsβEarly Cold War)
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Outbreak of World War I
1914 (Documented record)
What happened
Triggered by the assassination of the Austrian archduke and his wife in Sarajevo, the alliance systems of the European powers activated in a chain reaction, escalating into all-out war.
Why it matters
With trench warfare and new weapons (machine guns, poison gas, tanks), it caused the worst loss of life up to that time and fundamentally shook the Europe-centered world order.
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The Russian Revolution
1917 (Documented record)
What happened
War-weariness and discontent with tsarist rule exploded: the February Revolution toppled the monarchy, and the October Revolution that followed brought Lenin's Bolsheviks to power.
Why it matters
The world's first socialist state (the Soviet Union) was established, later becoming one pillar of the 20th-century Cold War order.
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End of World War I and the Treaty of Versailles
1918β1919 (Documented record)
What happened
Germany surrendered and the war ended; the Treaty of Versailles imposed enormous reparations and territorial losses on Germany.
Why it matters
The harsh punishment of Germany is seen as one of the backgrounds for the rise of extreme nationalism (Nazism) there, sowing the seeds of World War II.
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Founding of the League of Nations
1920 (Documented record)
What happened
To prevent a repeat of the horrors of World War I, the League of Nations was founded as an international organization to settle disputes peacefully.
Why it matters
Humanity's first permanent international peace organization, but it lacked enforcement power and failed to prevent World War II; it was succeeded by the United Nations (UN).
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The Great Depression
1929 (Documented record)
What happened
Starting with the stock market crash in New York, the whole world fell into a severe economic depression, with mass unemployment and business failures.
Why it matters
It exposed the limits of laissez-faire capitalism and spurred government-interventionist economic policies such as the US New Deal, while fostering the rise of extremist political forces in Germany, Italy, and Japan.
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Rise of Italian Fascism - Mussolini
1922 (Documented record)
What happened
Mussolini's Fascist Party seized power through the March on Rome, establishing the world's first fascist regime.
Why it matters
The prototype of a totalitarian regime built on nationalism and statism, it also influenced the later rise of Nazism in Germany.
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Rise of Nazism in Germany - Hitler Takes Power
1933 (Documented record)
What happened
Riding on economic hardship from the Great Depression and resentment of the Treaty of Versailles, Hitler's Nazi Party came to power through legal elections.
Why it matters
The Nazi regime, built on extreme racism and totalitarianism, went on to cause World War II and the Holocaust, the worst tragedies in human history.
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Outbreak of the Second Sino-Japanese War
1937 (Documented record)
What happened
A war that began with Japan's full-scale invasion of China, during which mass killings of civilians such as the Nanjing Massacre were committed.
Why it matters
The prelude to World War II in the Asia-Pacific region, it later expanded into the Pacific War.
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Outbreak of World War II - Germany Invades Poland
1939 (Documented record)
What happened
When Nazi Germany launched a lightning invasion of Poland, Britain and France declared war on Germany and all of Europe was engulfed in war.
Why it matters
The most widespread and devastating war in human history; over about five and a half years, most countries of the world were directly or indirectly involved.
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Attack on Pearl Harbor and the Pacific War
1941 (Documented record)
What happened
Japan launched a surprise attack on the US naval base at Pearl Harbor, Hawaii, bringing the United States fully into World War II.
Why it matters
A war previously focused on Europe spread across the Pacific and Asia, and US entry greatly strengthened the Allied forces.
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The Holocaust
1941β1945 (Documented record)
What happened
Nazi Germany systematically murdered about six million Jews and many members of other minority groups in concentration and extermination camps.
Why it matters
The most systematic and horrific genocide in human history, it led the international community to build a framework of international law on war crimes and human rights (such as the Genocide Convention).
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The Normandy Landings
1944 (Documented record)
What happened
The Allies carried out a massive landing on the Normandy coast of France, opening a Western European front, then liberated Paris and pressed on Germany.
Why it matters
The largest amphibious invasion in history and a decisive turning point that hastened the defeat of Nazi Germany in Europe.
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The Yalta and Potsdam Conferences
1945 (Documented record)
What happened
Conferences at which the leaders of the US, Britain, and the Soviet Union discussed the postwar settlement, deciding matters such as the divided occupation of Germany and the Korean Peninsula and Soviet entry into the war against Japan.
Why it matters
Decisions made at these conferences directly shaped the Cold War world order and the division of the Korean Peninsula.
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Atomic Bombings of Hiroshima and Nagasaki and Japan's Surrender
1945 (Documented record)
What happened
The United States dropped atomic bombs on Hiroshima and Nagasaki, and when the Soviet Union also entered the war against Japan, Japan announced its unconditional surrender, ending World War II.
Why it matters
The only nuclear weapons ever used in war; their devastation became an important background to later debates on nuclear non-proliferation and disarmament.
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Founding of the United Nations (UN)
1945 (Documented record)
What happened
To avoid repeating the horrors of World War II, the United Nations was founded as a new international peace organization replacing the League of Nations.
Why it matters
It still functions as the core body for maintaining international peace and security, and has been involved in Korean Peninsula issues many times, including its resolution to send forces in the Korean War.
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Beginning of the Cold War - The Truman Doctrine and the Marshall Plan
1947 (Documented record)
What happened
The US announced the Truman Doctrine to contain the spread of communism and carried out the Marshall Plan to support European reconstruction, and the rivalry between the free and communist blocs led by the US and the Soviet Union began in earnest.
Why it matters
The start of the Cold War order that lasted some 40 years; the division of Korea and the Korean War were also products of this Cold War rivalry.
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Founding of the People's Republic of China
1949 (Documented record)
What happened
The Chinese Communist Party led by Mao Zedong won the Chinese Civil War and founded the People's Republic of China, while the defeated Nationalist government moved to Taiwan.
Why it matters
With the world's most populous country becoming communist, the communist bloc expanded greatly in the Cold War, which directly affected the Korean War the following year.
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Indian Independence
1947 (Documented record)
What happened
Helped by movements such as Gandhi's nonviolent resistance, India won independence from Britain, but was partitioned into Hindu-majority India and Muslim-majority Pakistan.
Why it matters
It greatly influenced independence movements in colonies across Asia and Africa, but the partition of India and Pakistan caused mass bloodshed and refugees.
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The Berlin Blockade and the Founding of NATO
1948β1949 (Documented record)
What happened
When the Soviet Union blockaded land routes to West Berlin, the West supplied the city by airlift, and this crisis led Western countries to found the North Atlantic Treaty Organization (NATO).
Why it matters
An early Cold War moment when USβSoviet confrontation came close to armed conflict; it also led to the division of Germany into East and West.
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Founding of Israel
1948 (Documented record)
What happened
Following the UN partition plan for Palestine, Jews founded Israel in the Palestine region, but war with neighboring Arab states (the First ArabβIsraeli War) broke out immediately.
Why it matters
The direct starting point of the Palestinian conflict in the Middle East that continues to this day.
Contemporary Era (PostβCold WarβPresent)
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The Cuban Missile Crisis
1962 (Documented record)
What happened
When the Soviet Union tried to deploy nuclear missiles in Cuba, the US responded with a naval blockade; the two superpowers came to the brink of nuclear war before dramatically reaching a compromise.
Why it matters
Considered the moment humanity came closest to nuclear war during the Cold War, it led to crisis-management measures such as the USβSoviet leaders' direct hotline.
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The Vietnam War
1955β1975 (Documented record)
What happened
A war between communist North Vietnam and US-backed South Vietnam; the US intervened on a massive scale but eventually withdrew, and Vietnam was unified under communism.
Why it matters
A signature US setback of the Cold War that fueled a major anti-war movement in the US; South Korea also sent troops to this war.
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Decolonization of Africa
1950sβ60s (Scholarly consensus)
What happened
After World War II, with the spread of national self-determination, many African colonies won independence one after another; in 1960 alone, 17 countries became independent, earning it the name 'Year of Africa.'
Why it matters
A symbolic trend marking the effective end of the era of European imperialism, but the artificial colonial-era borders remained seeds of civil wars and conflicts in many African countries.
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China's Cultural Revolution
1966β1976 (Documented record)
What happened
To strengthen his political position, Mao Zedong launched a massive political campaign purging traditional culture, intellectuals, and opponents, plunging all of Chinese society into severe turmoil.
Why it matters
A period in which millions died and China's scholarship and economic development suffered major setbacks; today the Chinese Communist Party itself officially acknowledges it as a mistake.
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The Protests of 1968
1968 (Documented record)
What happened
Beginning with student and worker protests in Paris, a movement resisting authoritarian establishments and social conventions spread to many countries including the US and Germany.
Why it matters
By challenging traditional authority and values, it laid the groundwork for the growth of new social movements such as the women's and environmental movements.
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Nixon's Visit to China and DΓ©tente
1972 (Documented record)
What happened
US President Nixon made a surprise visit to China, a former adversary, opening the way to normalized relations and becoming a symbol of dΓ©tente (the easing of Cold War tensions).
Why it matters
Cracks appeared in the rigid confrontation between Cold War blocs, leading to further tension-reducing diplomacy such as USβSoviet arms control talks.
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The First Oil Shock
1973 (Documented record)
What happened
Triggered by the ArabβIsraeli war, Arab oil-producing countries cut output and sharply raised prices, causing a severe oil crisis and economic turmoil worldwide.
Why it matters
It laid bare the world economy's dependence on oil, after which energy security and alternative energy development became major national priorities.
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The Iranian Islamic Revolution
1979 (Documented record)
What happened
The pro-Western, secular Pahlavi monarchy fell, and Islamic clerical forces led by Khomeini took power and established an Islamic republic.
Why it matters
It marked the full-scale rise of political Islamism in the Middle East and continues to affect USβIran relations and the region's politics to this day.
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Soviet Reform - Gorbachev's Perestroika
1985~ (Documented record)
What happened
Soviet Communist Party General Secretary Gorbachev pursued economic restructuring (perestroika) and openness (glasnost) in an attempt to reform the Soviet system.
Why it matters
Reforms that fundamentally shook the Cold War order, becoming the decisive trigger for the collapse of the Eastern European communist bloc and the dissolution of the Soviet Union.
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Fall of the Berlin Wall
1989 (Documented record)
What happened
As communist regimes in Eastern Europe fell one after another, the Berlin Wall, the symbol of Cold War division, was torn down by citizens.
Why it matters
The iconic event symbolizing the end of the Cold War, it led to German reunification the following year.
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Dissolution of the Soviet Union
1991 (Documented record)
What happened
After Gorbachev's reforms, demands for independence by the republics intensified, and the Soviet Union finally dissolved into 15 independent states.
Why it matters
One pillar of the Cold War that dominated the 20th century vanished entirely, giving rise to a US-centered unipolar order.
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German Reunification
1990 (Documented record)
What happened
The year after the fall of the Berlin Wall, Germany was reunified into a single state, with East Germany absorbed into West Germany.
Why it matters
An example of overcoming 45 years of division after World War II, it is still frequently referenced in discussions of Korean reunification.
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Launch of the European Union (EU)
1993 (Documented record)
What happened
With the Maastricht Treaty in force, the European Community developed into the European Union, encompassing political and economic integration, and the single currency, the euro, was later introduced (2002).
Why it matters
Europe, the stage of two world wars, achieved economic and political integration β regarded as the leading experiment in integration between nations.
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The September 11 Attacks
2001 (Documented record)
What happened
The Islamist extremist terrorist group al-Qaeda used hijacked airliners to attack the World Trade Center in New York and the Pentagon, killing about 3,000 people.
Why it matters
It highlighted international terrorism as a new postβCold War security threat and led to the US wars in Afghanistan and Iraq.
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The Global Financial Crisis
2008 (Documented record)
What happened
Triggered by the collapse of the US housing bubble and the bankruptcy of major financial firms (such as Lehman Brothers), the whole world suffered a severe financial crisis and recession.
Why it matters
It showed that in an era of financial globalization one country's financial crisis can spread worldwide in an instant, leading to discussions on tighter international financial regulation.
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The Arab Spring
2011 (Documented record)
What happened
Anti-government protests that began in Tunisia spread to many countries in the Middle East and North Africa, including Egypt, Libya, and Syria, toppling long-standing dictatorships one after another.
Why it matters
A large-scale democratization movement spread through social media, but in some countries it led to civil war and chaos, and outcomes varied greatly from country to country.
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Brexit (the UK's Decision to Leave the European Union)
2016 (Documented record)
What happened
The United Kingdom decided by referendum to leave the European Union and, after negotiations, formally left in 2020.
Why it matters
A symbolic reversal of the trend toward European integration, it drew attention as an example of the spread of anti-globalization and nationalist sentiment around the world.
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The COVID-19 Pandemic
2020 (Documented record)
What happened
A novel coronavirus disease that began in Wuhan, China, spread around the world, and the World Health Organization (WHO) declared a pandemic.
Why it matters
The greatest health crisis of the 21st century, killing millions worldwide and dealing a heavy blow to economies and societies, it accelerated the shift toward a contactless society.
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Russia's Invasion of Ukraine
2022 (Documented record)
What happened
Russia launched a full-scale invasion of Ukraine, starting the largest war in Europe since World War II.
Why it matters
It shook the European security order long considered stable after the Cold War, and continues to have a major impact on international affairs and on energy and food markets.