History
By the Decade From the 1840's to the end of the 1940s
Circa
1840-1850 Expansionism and Manifest Destiny
Circa
1850-1865 Slavery and the Civil War
Circa
1880-1900 The Gilded Age
1900-1920
Progressive Era and World War I
1920-1929
Roaring Twenties
1930-1939
The Depression
1940s
World War II