Major Eras of U.S. History for 11th Grade By EliasHutson Jan 1, 1865 Westward Expansion (Begins) Jan 1, 1877 The Guilded Age (Begins) Jan 1, 1890 Westward Expansion (Ends) Jan 1, 1898 U.S. Imperialism (Begins) Jan 1, 1900 Guilded Age (Ends) Jan 1, 1900 Progressive Era (Starts) Jan 1, 1914 U.S. Imperialism (Ends) Jan 1, 1914 World War I (Begins) Jan 1, 1918 World War I (Ends) Jan 1, 1919 Progressive Era (Ends) Jan 1, 1920 The Roaring Twenties (Begins) Jan 1, 1929 The Roaring Twenties (Ends) Jan 1, 1929 The Great Depression (Begins) Jan 1, 1939 World War II (Begins) Jan 1, 1941 The Great Depression (Ends) Jan 1, 1945 World War II (Ends) Jan 1, 1945 The Cold War (Begins) Jan 1, 1954 The Civil Rights Movements (Begins) Jan 1, 1954 Vietnam War (Begins) Jan 1, 1968 The Civil Rights Movement (Ends) Jan 1, 1970 Late 20th Century (Begins) Jan 1, 1975 Vietnam War (Ends) Jan 1, 1991 The Cold War (Ends) Jan 1, 1999 Late 20th Century (Ends) Jan 1, 2000 U.S. in the 20th Century Jan 1, 2016 U.S. in the 20th Century (Present)