| A | B |
| Industrial, Global U.S. | U.S. grows to become a world leader in factory production; cities grow as immigrants pour in |
| Civil War & Reconstruction | North fights South, 600,000 die, & the Nation comes back together |
| Expansion & Reform | Americans move west & change their attitudes about slavery, women's rights and education |
| Revolution & New Nation | British Colonies Rebel, win a war with Great Britain, & form the U.S. |
| Colonization & Settlement | British move onto Atlantic Coast, French to the North & Spanish to the South |
| Meeting of the 3 Worlds | People from Asia, Africa & Europe meet for the first time in the first American colonies |
| How many ERAS are in American History? | 10 |
| How many ERAS will we study this year? | 3 |
| What year does ERA 3 begin with? | 1754 |
| What year does ERA 5 end with? | 1877 |