U.S History 1887- By ashley.gonzales Period: 1776 to 1860 Early American History Period: 1860 to 1877 Civil war /Reconstruction Period: 1877 to 1900 The Gilded Age Period: 1890 to 1920 The Progressive Era Period: 1898 to 1910 Imperialism Period: 1914 to 1918 World War 1 Period: 1920 to 1929 Roaring Twenties Period: 1929 to 1939 Great Depression Period: 1939 to 1945 World War 2 1945 United Nations formed Period: 1945 to 1960 Early cold war 1948 Berlin Airlift 1949 NATO established 1950 Korean war 1950-1953 Period: 1950 to 1970 Civil rights Era 1951 Rosenbergs trial 1952 First H- Bomb detonated by the united states Period: 1954 to 1976 Vietnam war 1955 Jonas Salk invents the polio vaccine 1957 USSR launches sputnik Period: 1970 to 1991 End of the cold war Period: 1990 to 2008 1900s 21st century