High Quality Content by WIKIPEDIA articles! The Sixty-sixth United States Congress was a meeting of the legislative branch of the United States federal government, comprising the United States Senate and the United States House of Representatives. It met in Washington, DC from March 4, 1919 to March 4, 1921, during the last two years of Woodrow Wilson`s presidency. The apportionment of seats in the House of Representatives was based on the Thirteenth Census of the United States in 1910. Both chambers had a Republican majority.