| A | B |
|---|
| Mississippi River | westernmost border of the US before the Louisiana Purchase |
| Oregon Territory | land disputed between Britain and the US |
| Mexican Cession | land that Mexico was forced to cede [give up] to the US after the Mexican War |
| Texas Annexation | land that the US got after Texas became part of the US and US and Mexico went to war |
| Northwest Territory | the first piece of land that would be converted from a territory into states |
| Great Plains | flatlands where small farmers farmed |
