| A | B |
| Gila River | Boundary before this treaty |
| Rio Grande | Boundary after this treaty |
| Railroad | Completion of this is the big motivator for America |
| Mexico | Sold this territory to USA |
| $10 Million | Sum America pays for this territory |
| James Gadsden | Ambassador who negotiated this treaty |
| treaty | An official agreement between countries |
| Gadsden Purchase | last territory to be added to the US |
| 1848 | Date of the Mexican-American War |
| 1853 | Date of treaty |
| California | Area not a part of this treaty, but the most important destination for the RRs |
| New Mexico & Arizona | Southern sections of these states were added |
| Name of this reaty | Guadalupa Hidalgo |
| Foreign Relations | term for countries forming relationships |
| To be Good Neighbors | Real reason this Treaty was made |