US History Timeline By lisa.ponce Period: 1870 to 1900 The Gilded Age Period: 1897 to 1920 The Progressive Era Period: Jul 28, 1914 to Nov 11, 1918 World War l Period: 1920 to 1929 The Roaring Twenties´ Period: 1929 to 1933 The Great Depression Period: 1930 to 1940 Imperialism Period: 1939 to 1945 World War ll Period: 1947 to 1953 Early Cold War