The 89th 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, 1965, to January 3, 1967, during the second and third years of Lyndon B. Johnson's presidency. The apportionment of seats in the House of Representatives was based on the 1960 United States census. Both chambers had a Democratic supermajority, and with the election of President Lyndon B. Johnson to his own term in office, maintaining an overall federal government trifecta. This is the last time Democrats or any party had a 2/3rd supermajority in the Senate. The 89th Congress is regarded as "arguably the most productive in American history". Some of its landmark legislation includes Social Security Amendments of 1965 (the creation of Medicare and Medicaid), the Voting Rights Act, Higher Education Act, Immigration and Nationality Act of 1965, Elementary and Secondary Education Act and the Freedom of Information Act. Major events January 4, 1965: President Johnson proclaimed his "Great Society" during his State of the Union Address. January 20, 1965: Inauguration of President Lyndon B. Johnson for a full term. November 8, 1966: United States elections, 1966, including: United States Senate elections, 1966 United States House of Representatives elections, 1966 Major legislation April 11, 1965: Elementary and Secondary Education Act, July 27, 1965: Federal Cigarette Labeling and Advertising Act, July 30, 1965: Social Security Act of 1965, (including Medicaid and Medicare) August 6, 1965: Voting Rights Act, August 10, 1965: Housing and Urban Development Act of 1965, August 26, 1965: Public Works and Economic Development Act of 1965, September 9, 1965 Department of Housing and Urban Development Act, , September 29, 1965: National Foundation on the Arts and the Humanities Act, October 3, 1965: Immigration and Nationality Act of 1965, (Hart-Celler Act, INS Act) October 6, 1965: Heart Disease, Cancer, and Stroke Amendments, October 20, 1965: Motor Vehicle Air Pollution Control Act, (including Solid Waste Disposal Act) October 22, 1965: Highway Beautification Act, November 8, 1965: Higher Education Act, November 8, 1965: Vocational Rehabilitation Act Amendments August 26, 1966: Laboratory Animal Welfare Act Now called the Animal Welfare Act April 13, 1966: Uniform Time Act, July 13, 1966: Cotton Research and Promotion Act, September 6, 1966: , which (among other things) enacted what is now called the Freedom of Information