House, Senate, and Congress: Members, Powers, and Lawmaking

Congress is the entire legislative branch of the United States federal government, and it is made up of two chambers: the House of Representatives and the Senate. So the difference between the House, the Senate, and Congress is really a difference of scope: “Congress” names the whole institution, while the House and the Senate are its two halves, each with its own size, term length, qualifications, and exclusive powers. No federal law can take effect unless both chambers pass it in identical form.1Congress.gov. U.S. Constitution – Article I

The two-chamber design came out of the Constitutional Convention of 1787. Large states wanted representation based on population; small states wanted every state treated equally. The Great Compromise did both, giving population-weighted seats to one chamber and equal state representation to the other.2Congress.gov. ArtI.S1.2.3 The Great Compromise of the Constitutional Convention That bargain is why the House and Senate look so different from each other today.

Who Sits in the House

The House has 435 voting members. That number was fixed by the Permanent Apportionment Act of 1929, and the seats are redistributed among the states after every decennial census, so a state’s delegation can grow or shrink as its population shifts relative to the rest of the country.3Congressional Research Service. Size of the U.S. House of Representatives Six non-voting delegates also sit in the House, representing the District of Columbia, Puerto Rico, Guam, American Samoa, the U.S. Virgin Islands, and the Northern Mariana Islands. They can introduce bills, speak on the floor, and vote in committees, but not on final passage.4Congress.gov. Delegates to the U.S. Congress: History and Current Status

To serve in the House, a person must be at least 25 years old, have been a U.S. citizen for at least seven years, and live in the state they represent at the time of the election.5Congress.gov. ArtI.S2.C2.1 Overview of House Qualifications Clause Terms run two years, and every single seat is up in every even-numbered year.6Legal Information Institute. U.S. Constitution – Article I That short cycle keeps the House close to current public opinion. Each representative is elected from a single congressional district, which is why the House is the chamber where local issues get the most direct voice.

Who Sits in the Senate

The Senate has 100 members: two from every state, no matter how big or small.7USAGov. U.S. Senate Wyoming, with a population under 600,000, gets the same two senators as California, with more than 39 million people. That equal footing was the price small states demanded for ratifying the Constitution.

Senators must be at least 30 years old, have held U.S. citizenship for at least nine years, and live in the state they represent.8Constitution Annotated. ArtI.S3.C3.1 Overview of Senate Qualifications Clause Terms last six years, and the seats are staggered into three classes so only about a third of the Senate is up in any given election.9Legal Information Institute. Staggered Senate Elections Two-thirds of the body always carries over, which makes the Senate much slower to shift than the House.

State legislatures used to pick senators. The 17th Amendment, ratified in 1913, changed that to direct popular election.10Congress.gov. Seventeenth Amendment

Who Runs Each Chamber

The Speaker of the House is the most powerful figure in that chamber. The Speaker decides which bills reach the floor, recognizes members to speak, rules on procedural questions, and appoints members to conference committees.11Congress.gov. The Speaker of the House: House Officer, Party Leader, and Representative The Speaker also stands second in the presidential line of succession, behind the Vice President. Each party in the House also elects a floor leader and a whip.

The Senate is presided over, technically, by the Vice President of the United States, who votes only to break a tie.12U.S. Senate. About the Vice President (President of the Senate) When the Vice President is absent, the President pro tempore presides. By modern tradition that role goes to the longest-serving member of the majority party, and unlike the Vice President the President pro tempore cannot cast a tiebreaking vote.13U.S. Senate. About the President Pro Tempore The real power in the Senate sits with the Majority Leader, who controls the floor schedule and decides which bills get a vote. Each party has a whip as well.14United States Senate. Party Whips

What Each Chamber Can Do Alone

Some jobs belong to only one chamber. These exclusive powers are where the difference between the House and the Senate really lands.

The House alone:

The Senate alone:

Everything else, including the power of the purse, is shared. Money can leave the Treasury only if Congress appropriates it by law, and that takes both chambers.

How the Two Chambers Make Law Together

A bill can be introduced in either chamber, with the revenue-bill exception noted above. It goes first to a committee, which is where most of the actual work of Congress happens. The committee holds hearings, calls witnesses, marks up the text, and decides whether to send it to the full chamber. Most bills die in committee.

If the bill passes one chamber, it moves to the other and goes through the same process. Both chambers have to pass it in identical form. When the House and Senate produce different versions, a conference committee with members from each side negotiates a single compromise text, and both chambers vote on that. If it passes, it goes to the President, who signs it into law or vetoes it. Congress can override a veto, but only with a two-thirds vote in each chamber, which rarely happens.20National Archives and Records Administration. The Presidential Veto and Congressional Veto Override Process

The Filibuster Sets the Senate Apart

One procedural gap between the chambers matters more than any other. In the House, a simple majority can end debate and force a vote. In the Senate, any senator can extend debate on most legislation unless 60 senators vote to invoke cloture and cut it off.21U.S. Senate. About Filibusters and Cloture – Historical Overview In practice, that means most major bills need 60 Senate votes to pass, even though the Constitution requires only a simple majority. The filibuster does not apply to nominations: rule changes in the 2010s let a simple majority end debate on judicial and executive-branch nominees.

Put simply: Congress is the whole legislature, the House is the fast-moving population-weighted half, and the Senate is the slower state-weighted half with the extra power to confirm nominees and ratify treaties. A bill has to survive both chambers, and in the Senate it usually has to survive the filibuster too, before it ever reaches the President’s desk.