| A | B |
|---|
| Louisiana Purchase | 1803: Land from France doubles the size of the US |
| Florida Cession | 1819: Land from Spain for $5 Million |
| Texas Annexation | 1845: Creates dispute with Mexico over border |
| Oregon Country | 1846: US adds Oregon by Treaty with Great Britain |
| Mexican Cession | 1848: Mexico gives up land under Treaty of Guadalupe Hidalgo |
| Gadsden Purchase | 1853: Land from Mexico to build a southern railroad |
| Manifest Destiny | US should expand from Atlantic to Pacific |
| Transcontinental Railroad | Built to link east and west, make land travel faster |
| Mexican-American War | US fights war against Mexico over Rio Grande border |
| Gold Rush | 49ers and Chinese go to California to mine gold |
