The 1st United States Congress, comprising the United States Senate and the United States House of Representatives, met from March 4, 1789, to March 4, 1791, during the first two years of George Washington's presidency, first at Federal Hall in New York City and later at Congress Hall in Philadelphia. With the initial meeting of the First Congress, the United States federal government officially began operations under the new frame of government established by the 1787 Constitution. The apportionment of seats in the House of Representatives was based on the provisions of Article I, Section 2, Clause 3, of the Constitution. Both chambers had a Pro-Administration majority. Twelve articles of amendment to the Constitution were passed by this Congress and sent to the states for ratification; the ten ratified as additions to the Constitution on December 15, 1791, are collectively known as the Bill of Rights, with an additional amendment ratified more than two centuries later to become the Twenty-seventh Amendment to the United States Constitution.
The 2nd United States Congress, consisting of the United States Senate and the United States House of Representatives, met at Congress Hall in Philadelphia, Pennsylvania, from March 4, 1791, to March 4, 1793, during the third and fourth years of George Washington's presidency. The apportionment of seats in the House of Representatives was based on the provisions of Article I, Section 2, Clause 3 of the United States Constitution. Additional House seats were assigned to the two new states of Vermont and Kentucky. Both chambers had a Pro-Administration majority.
The 3rd United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met at Congress Hall in Philadelphia, Pennsylvania from March 4, 1793, to March 4, 1795, during the fifth and sixth years of George Washington's presidency.
The 5th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met at Congress Hall in Philadelphia, Pennsylvania, from March 4, 1797, to March 4, 1799, during the first two years of John Adams' presidency. In the context of the Quasi-War with France, the Alien and Sedition Acts were passed by Congress. The Acts were overwhelmingly supported by the Federalists and mostly opposed by the Democratic-Republicans. Some Democratic-Republicans, such as Timothy Bloodworth, said they would support formally going to war against France but they opposed the Alien and Sedition Acts which Bloodworth and others believed were unconstitutional.
The 6th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the Senate and the House of Representatives. It met at Congress Hall in Philadelphia, Pennsylvania and in Washington, D.C. from March 4, 1799, to March 4, 1801, during the last two years of John Adams's presidency. It was the last Congress of the 18th century and the first to convene in the 19th. The apportionment of seats in House of Representatives. was based on the 1790 United States census. Both chambers had a Federalist majority. This was the last Congress in which the Federalist Party controlled the presidency or either chamber of Congress.
The 7th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1801, to March 4, 1803, during the first two years of Thomas Jefferson's presidency. The apportionment of seats in the House of Representatives was based on the 1790 United States census. Both chambers had a Democratic-Republican majority, except during the Special session of the Senate, when there was a Federalist majority in the Senate.
The 9th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1805, to March 4, 1807, during the fifth and sixth years of Thomas Jefferson's presidency. The apportionment of seats in the House of Representatives was based on the 1800 United States census. Both chambers had a Democratic-Republican majority.
The 10th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the Senate and the House of Representatives. It met in Washington, D.C., from March 4, 1807, to March 4, 1809, during the seventh and eighth years of Thomas Jefferson's presidency. The apportionment of seats in the House of Representatives was based on the 1800 census; both chambers had an overwhelming Democratic-Republican majority.
The 11th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1809, to March 4, 1811, during the first two years of James Madison's presidency. The apportionment of seats in the House of Representatives was based on the 1800 United States census. Both chambers had a Democratic-Republican majority.
The 13th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1813, to March 4, 1815, during the fifth and sixth years of James Madison's presidency. The apportionment of seats in the House of Representatives was based on the 1810 United States census. Both chambers had a Democratic-Republican majority. The first two sessions were held at the Capitol building while the third, convened after the Burning of Washington, took place in the First Patent Building.
The 15th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in the Old Brick Capitol in Washington, D.C. from March 4, 1817, to March 4, 1819, during the first two years of James Monroe's presidency. The apportionment of seats in the House of Representatives was based on the 1810 United States census. Both chambers had a Democratic-Republican majority.
The 17th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. While its term was officially March 4, 1821, to March 4, 1823, during the fifth and sixth years of James Monroe's presidency, its first session began on December 3, 1821, ending on May 8, 1822, and its second session began on December 2, 1822, to March 3, 1823. The apportionment of seats in the House of Representatives was based on the 1810 United States census. Both chambers had a Democratic-Republican majority.
The 18th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1823, to March 4, 1825, during the seventh and eighth years of James Monroe's presidency. The apportionment of seats in the House of Representatives was based on the 1820 United States census. Both chambers had a Democratic-Republican majority.
The 23rd United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1833, to March 4, 1835, during the fifth and sixth years of Andrew Jackson's presidency. The apportionment of seats in the House of Representatives was based on the 1830 United States census. The Senate had an Anti-Jacksonian or National Republican majority, and the House had a Jacksonian or Democratic majority.
The 72nd United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1931, to March 4, 1933, during the last two years of Herbert Hoover's presidency. The apportionment of seats in this House of Representatives was based on the 1910 United States census. The Senate had a Republican majority. The House started with a very slim Republican majority, but by the time it first met in December 1931, the Democrats had gained a majority through special elections.
The 36th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1859, to March 4, 1861, during the third and fourth years of James Buchanan's presidency. The apportionment of seats in the House of Representatives was based on the 1850 United States census. The Senate had a Democratic majority, and the House had a Republican plurality.
The 38th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C., from March 4, 1863, to March 4, 1865, during the last two years of President Abraham Lincoln's first term in office. The apportionment of seats in the House of Representatives was based on the 1860 United States census. The Senate had a Republican majority, and the House of Representatives had a Republican plurality.
The 45th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1877, to March 4, 1879, during the first two years of Rutherford Hayes's presidency. The apportionment of seats in the House of Representatives was based on the 1870 United States census. The Senate had a Republican majority, and the House had a Democratic majority.
The 4th United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met at Congress Hall in Philadelphia, Pennsylvania, from March 4, 1795, to March 4, 1797, during the last two years of George Washington's presidency. The apportionment of seats in the House of Representatives was based on the 1790 United States census. The Senate had a Federalist majority, and the House had a Democratic-Republican majority.
The 1804–05 United States Senate elections were held on various dates in various states. As these U.S. Senate elections were prior to the ratification of the Seventeenth Amendment in 1913, senators were chosen by state legislatures. Senators were elected over a wide range of time throughout 1804 and 1805, and a seat may have been filled months late or remained vacant due to legislative deadlock. In these elections, terms were up for the senators in Class 2.
