| A | B |
|---|
| 1801 to 1861 | New territories added to US |
| Jefferson bought Louis. Purchase from | France |
| Doubled the size of US | Louisiana Purchase |
| Lewis and Clark | Explored Louisiana Purchase |
| Spain | gave Florida to US |
| Texas | added to US after independent republic |
| Oregon | divided by US and Great Britain |
| California, SW and Mexican Cession | War with Mexico |
| Gold Rush | California |
| Columbia and Missouri | Rivers explored by Lewis and Clark |
