The 43rd 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, 1873, to March 4, 1875, during the fifth and sixth years of Ulysses S. Grant's presidency.

The 42nd 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, 1871, to March 4, 1873, during the third and fourth years of Ulysses S. Grant's presidency. The apportionment of seats in the House of Representatives was based on the 1860 United States census. Both chambers had a Republican majority.