1955-1975 By akgreen 1955 Polio Vaccine 1955 Rosa Parks Arrested Period: 1955 to 1975 Vietnam War 1957 First Nuclear Power Plant 1957 Little Rock Desegregation 1958 U.S. Launches Satellite 1960 John F. Kennedy becomes president 1961 Lyndon B. Johnson Visits South Vietnam 1961 Bay of Pigs 1963 Kennedy Assassinated 1963 Martin Luther King Jr I Have a Dream Speech 1964 Lyndon B. Johnson wins the presidential election 1967 March on the Pentagon 1968 Martin Luther King, Jr. Assassinated 1968 Nixon Elected President 1971 26th Amendment Ratified