Click on the links below to view each unit organizer:
Unit 1: Period 1 1491-1607
Unit 2: Period 2 1607-1754
Unit 3: Period 3 1754-1800
Unit 4: Period 4 1800-1848
Unit 5: Period 5 1844-1877
Unit 6: Period 6 1865-1898
Unit 7: Period 7 1890-1945
Unit 8: Period 8 1945-1980
Unit 9: Period 9 1980 to the Present
