the seventy-seventh united states congress was a meeting of the legislative branch of the united states federal government, composed of the united states senate and the united states house of representatives. it met in washington, dc from january 3, 1941, to january 3, 1943, during the ninth and tenth years of franklin d. roosevelt's presidency. the apportionment of seats in the house of representatives was based on the sixteenth census of the united states in 1940. both chambers had a democratic majority.