Pre-1585 (Before European Contact)
1585–1763 (Colonization)
1754–1800 (Revolution and a New Nation)
1792–1861 (Expansion and Reform)
1850–1877 (Civil War and Reconstruction)
1870–1920 (Development of Industrial US)
1920–1945 (Great Depression and World War II)
1945–1989 (Post-World War II United States)
1980–Present (US in a New Global Age)
