Major Eras in United States History From 1877 By ariam_lehcar Period: Jan 1, 1877 to Dec 31, 1900 The Gilded Age – Post Reconstruction [1877] - 1900 Period: Jan 1, 1898 to Dec 31, 1919 Age of Imperialism and Reform – 1898 - 1919 Period: Jan 1, 1914 to Dec 31, 1918 World War I – 1914 – 1918 Period: Jan 1, 1920 to Oct 2, 1929 The Roaring 20s Period: Oct 2, 1929 to Dec 7, 1941 Great Depression: 1930s Period: Jan 1, 1930 to Dec 31, 1940 Rise of Dictators and World War II – 1930s and 1940s Period: Aug 25, 1945 to Dec 31, 1989 Cold War – Post WWII through the 1980s Period: Jan 1, 1950 to Dec 31, 1970 Civil Rights – 1950s, 1960s and beyond Period: Jan 1, 1970 to Dec 31, 1999 Late 20th Contemporary Issues 1980s – 2000 Period: Jan 1, 2000 to Dec 31, 2008 21st Century