Congress is the legislative branch of the US system of government and is divided into two chambers: the House of Representatives (lower chamber) and the Senate (upper chamber). The formal powers of Congress are set out in Article 1 of the US Constitution, and include making laws, collecting revenue, borrowing and spending money, declaring war, making treaties with foreign nations, and overseeing the executive branch. Elections to the US Congress occur in November every second year, with the Congress convening the following January. The current, 115th, Congress was elected in November 2016 and was convened in January 2017.
The US has a long-standing two-party system, which means that nearly all members of Congress belong to either the Republican or Democratic Parties, while independent members (if any) generally align or sit with one of the two main parties. At the most recent US Congressional and Presidential elections, in November 2016, the Republican Party retained its majority in both houses of Congress, as well as winning the White House.
The following EPRS Briefing is designed to provide key facts and figures about the US Congress as an institution, including relevant comparisons with the European Parliament. The back page contains a map showing the location of the various Congressional buildings on Capitol Hill, home to the Congress in Washington DC.