The 84th 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, D.C. from January 3, 1955, to January 3, 1957, during the third and fourth years of Dwight D. Eisenhower's presidency. The apportionment of seats in the House of Representatives was based on the 1950 United States census. The Democratic Party won back majorities in both the House and Senate, thus giving them full control of Congress, although Republican Party won the Senate in the last Congress. Major events January 28, 1955: Congress authorized the President to use force to protect Taiwan from the People's Republic of China February 10, 1955: The United States Navy helped the Republic of China evacuate Chinese Nationalist army and residents from the Tachen Islands to Taiwan. February 12, 1955: President Eisenhower sent the first U.S. advisers to South Vietnam. July 2, 1955: Senator Lyndon Johnson, Majority Leader of the United States Senate, suffered a major heart attack. September 24, 1955: President Eisenhower suffered a coronary thrombosis. November 5, 1955: Racial segregation was forbidden on trains and buses in U.S. interstate commerce. December 1, 1955: Rosa Parks was arrested for refusing to give up her seat on the bus to a white person. December 5, 1955: The American Federation of Labor and the Congress of Industrial Organizations merged to become the AFL–CIO. March 12, 1956: 96 Congressmen signed the Southern Manifesto, a protest against the 1954 Supreme Court ruling (Brown v. Board of Education) desegregating public education. November 6, 1956: United States elections, 1956: 1956 United States presidential election: Republican incumbent Dwight D. Eisenhower defeated Democratic challenger Adlai E. Stevenson in a rematch of their contest four years earlier. United States Senate elections, 1956: The party balance of the chamber remained unchanged as Republican and Democratic gains cancelled each other. United States House of Representatives elections, 1956: Republicans lost a net of two seats to the majority Democrats. Major legislation January 29, 1955: Formosa Resolution March 31, 1955: Career Incentive Act June 28, 1955: Flood Control and Coastal Emergency Act, , July 11, 1955: To provide that all United States currency shall bear the inscription "In God We Trust", , , July 14, 1955: Air Pollution Control Act, , ch. 360, July 23, 1955: Multiple Surface Use Mining Act, , ch.