time line

Period 1: 1491–1607
(Pre-Columbian societies to the founding of Jamestown)

Period 2: 1607–1754
(Colonial development up to the start of the French and Indian War)

Period 3: 1754–1800
(French and Indian War to the election of 1800)

Period 4: 1800–1848
(Jefferson’s presidency to the Seneca Falls Convention and end of the Mexican-American War)

Period 5: 1844–1877
(Manifest Destiny to the end of Reconstruction)

Period 6: 1865–1898
(Post–Civil War industrialization to the Spanish-American War)

Period 7: 1890–1945
(Progressive Era through WWII)

Period 8: 1945–1980
(Post–World War II to the Reagan election)

Period 9: 1980–Present
(Conservatism, globalization, and developments in the 21st century)