history By aydenmendoza23 Period: 1776 to 1860 early american history Period: 1860 to 1877 civil war/reconstruction Period: 1877 to 1900 gilded age Period: 1890 to 1920 progressive era Period: 1898 to 1910 imperialism Period: 1914 to 1918 wwl Period: 1920 to 1929 roaring twenties Period: 1929 to 1939 great depression Period: 1939 to 1945 wwll 1945 united nations formed Period: 1945 to 1960 early cold war 1947 22nd Admendment 1947 Truman doctrine 1948 Berlin airlift 1948 Marshal Plan 1949 nato established Period: 1950 to 1970 civil rights era 1951 rosenbergs trials 1952 First H bomb detonated by the United States 1953 korean war Period: 1954 to 1976 Vietnam 1955 Jonas Salk invents the Polio Vaccine 1955 Montgomery Bus Boycott after Rosa Parks’ arrest 1957 USSR launches Sputnik 1957 Little Rock Nine integrated into an all-white school in Little Rock 1961 Bay of Pigs Invasion in Cuba 1961 Berlin Wall built to prevent people from leaving communist East Berlin 1962 cuban missle crisis 1963 Martin Luther King’s “I Have a Dream Speech” at the March on Washington 1963 John F. Kennedy is assassinated in Dallas, TX 1965 medicare established 1968 tet offensive 1968 Martin Luther King is assassinated 1969 first man on the moon 1970 Kent State University shooting Period: 1970 to 1991 end of cold war 1971 pentagon papers leaked 1974 Watergate Scandal, which leads to Nixon’s Resignation 1975 fall of saigon 1978 Camp David Accords 1979 Three Mile Island Disaster 1981 Iran Hostage Crisis 1987 Iran Contra Affair Period: 1990 to 2008 1990's through 21st centry