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How the US Congress Works: House vs. Senate

The House and the Senate are often mentioned in the same breath, but they were deliberately built to represent the country in two very different ways.

Congress is bicameral: two separate chambers

The US legislative branch is split into the House of Representatives and the Senate. A bill generally must pass both chambers in identical form before it can go to the president to be signed into law.

House: 435 seats, based on state population

The House has 435 voting members, with each state's number of seats reapportioned roughly every 10 years based on census population data. Representatives serve two-year terms, and the entire House is up for election every cycle.

Senate: 100 seats, two per state regardless of size

Every state gets exactly two senators, regardless of population, giving smaller states proportionally far more influence per resident than they have in the House. Senators serve six-year terms, staggered so roughly one-third of the Senate is up for election every two years.

A deliberate compromise from 1787

The two-chamber design, often called the Great Compromise (or Connecticut Compromise), balanced large states that wanted representation based on population with small states that wanted equal representation regardless of size β€” hence a population-based House and an equal-per-state Senate.

How a bill generally becomes a law

A bill is introduced in either chamber (revenue bills must originate in the House), reviewed and often revised in committee, voted on by the full chamber, then sent to the other chamber to repeat the process. Only after both chambers pass an identical version does it go to the president, who can sign it or veto it.

Congress can override a presidential veto

If the president vetoes a bill, Congress can still enact it into law by passing it again with a two-thirds majority vote in both the House and the Senate β€” a check specifically designed to prevent the executive branch from having the final word alone.

Some powers belong to only one chamber

The Senate alone confirms presidential nominations (like cabinet members and federal judges) and ratifies treaties, and it alone holds impeachment trials. The House alone can initiate revenue bills and is the chamber that formally votes to impeach.

Not the same body as the Electoral College

Congress and the Electoral College are separate systems that both happen to weight small states more heavily than pure population would suggest β€” Congress through the fixed two-senators-per-state rule, and the Electoral College through each state's elector count being tied to its total congressional representation (House seats plus two senators).

Why committees matter more than the floor votes people see

Most of the substantive negotiation, amendment, and vetting of a bill happens inside committees before it ever reaches a full floor vote, which is why a bill can die quietly in committee without most of the public ever hearing about the specific version that was proposed.

Frequently Asked Questions

Why does a small state get the same number of senators as a large state?

It was a deliberate design choice from the Great Compromise of 1787, meant to reassure smaller states that they would not be permanently outvoted in a legislature based purely on population.

Who breaks a tie vote in the Senate?

The Vice President, in their constitutional role as President of the Senate, can cast a tie-breaking vote, though this happens relatively rarely given the Senate's 100-member, even-numbered size.

Can the House alone pass a law without the Senate?

No. A bill must pass both chambers in identical form before it can be sent to the president, regardless of which chamber it started in.