The House and the Senate
Congress is two different institutions that must agree before almost anything becomes law.
The Constitution splits legislative power between a House built on population and a Senate built on equal state representation. The two chambers have different sizes, terms, rules, and special powers — and a bill has to clear both in identical form. That design explains much of what makes Congress feel slow, negotiated, and hard to predict.
In republican government, the legislative authority necessarily predominates. The remedy for this inconveniency is to divide the legislature into different branches.
James Madison, Federalist No. 51
How Congress Works
Article I, the Constitution’s longest, creates Congress before the presidency or the courts. Every two years a new Congress convenes — the 119th began in January 2025 — and all of its unfinished bills die at the end of that two-year run. Within each Congress, most real work happens in committees, most scheduling is controlled by party leaders, and most bills never reach a vote. What reaches the floor has usually been negotiated long before.
The House of Representatives
The House was designed as the chamber closest to the people. Its 435 voting seats are divided among the states by population, every member faces voters every two years, and each represents a district of roughly 760,000 people. Six additional members — delegates from D.C. and four territories plus Puerto Rico’s resident commissioner — serve on committees but can’t cast final floor votes.
Size shapes everything. With hundreds of members, the House runs on tight rules set by the majority party: a Speaker elected by the full House, a powerful Rules Committee, and strict limits on debate and amendments. The Constitution also gives the House two special powers: revenue bills must start there, and it has the sole power to impeach. For today’s members and data, see the House of Representatives directory.
The Senate
The Senate gives every state two seats regardless of population, and senators serve six-year terms staggered so only about a third are up in any election. Senators were chosen by state legislatures until the 17th Amendment (1913) made them directly elected. The Vice President presides and can break a tie, though day-to-day leadership belongs to the majority leader.
Smaller size and longer terms produce a different culture: individual senators have far more leverage, business usually moves by unanimous consent, and most legislation needs 60 votes to end debate. The Senate alone confirms nominees, approves treaties by a two-thirds vote, and tries impeachments. For today’s senators, see the Senate directory.
Side by Side
Size and basis
House: 435 voting members, apportioned by population. Senate: 100 members, two per state.
Terms
House: two years, every seat at once. Senate: six years, one-third elected every two years.
Debate
House: time-limited under special rules. Senate: open-ended; ending debate usually takes 60 votes (cloture).
Leadership control
House: strong — Speaker and Rules Committee set the agenda. Senate: shared — majority leader schedules, but individual senators can delay.
Special powers
House: originates revenue bills; impeaches. Senate: confirms nominees; ratifies treaties; tries impeachments.
Why it matters for real bills
The House can pass a bill quickly under tight rules, while the Senate may slow, amend, or block the same proposal. Sometimes the Senate forces a compromise; sometimes House leaders refuse Senate changes; sometimes both chambers attach a policy to a must-pass bill. That friction is the design working as intended.
Why Two Chambers?
At the 1787 Convention, large states wanted representation by population and small states wanted equal votes for every state. The Great Compromise gave each side a chamber. The result is that a bill needs both a population-weighted majority in the House and a state-weighted majority in the Senate — which is why a proposal popular nationally can still stall if it can’t win enough individual states, and the reverse.
Disagreement is the default, on purpose
A two-chamber Congress isn’t a redundant single legislature. It was built to make agreement harder, forcing laws to satisfy two different theories of representation. That friction was the price of getting large and small states to accept the Constitution at all.
Representation: Districts and States
After every census, the 435 House seats are reapportioned among the states by population; every state gets at least one. States then draw district lines, a process called redistricting that can shift political power and is often challenged in court — see Shaw v. Reno, Thornburg v. Gingles, and Rucho v. Common Cause. Senators represent their entire state, so every American has exactly one representative and two senators.
Representation is also a daily job: members’ offices help constituents with federal agencies — Social Security, veterans’ benefits, passports, immigration cases — a service called casework. To find yours, use Find Your Representatives.
Leadership
Each chamber organizes itself by party. The majority party controls the agenda and every committee chair.
Speaker of the House
Elected by the full House; controls the floor, committee referrals, and the agenda. Second in line to the presidency.
Senate Majority Leader
Schedules floor business and negotiates unanimous-consent agreements. Gets first recognition on the floor.
Vice President & President pro tempore
The VP presides and breaks ties; the President pro tempore, usually the longest-serving majority senator, presides in the VP’s absence.
Minority leaders
Lead the opposition in each chamber and negotiate with the majority, especially in the Senate.
Whips
Count votes and keep party members together on key roll calls.
Committee chairs
Decide which bills get hearings and markups — often the real gatekeepers.