| A | B |
| Expansionists | People who believe that their country's prosperity depended on enlarging its territory |
| Annex | When a country takes control of a territory |
| Independence | Name of the city in Missouri where most of the trails began |
| Gadsden Purchase | 10 Million Dollars |
| Railroad | The US needed the land in the Gadsden Purchase to build these |
| Treaty of Guadalupe Hildalgo | The US bought Mexican lands for 15 million dollars |
| Rio Grande | The US wanted this river as a border between the US and Mexico |
| Bear Flag Republic | California was called this when it became an independent nation |
| Lone Star Republic | What Texas was called when it became an independent nation |
| Fifty-four Forty or Fight | When Americans demanded to receive all of Oregon, they stood behind this slogan |
| 49th Parallel | The boundry between Oregon and Canada |
| Utah | The Mormon trail leads to this state |
| Mission | The Alamo was once this before it became a fort |
| Ships | The first Americans reached California by... |
| Remember the Alamo | When Santa Anna ordered a Texan to spread the word of the defeat at the Alamo, the phrase that became a rallying cry to Texans was... |