4.
The idea that a long time ago, people believed it was meant to be for the United States to grow bigger and spread across the continent.
5.
When one place becomes part of another place, like when a new area becomes part of a country.
6.
A war fought between Mexico and the United States a long time ago, from 1846 to 1848, over who got to keep certain lands in North America.
9.
A deal where the United States bought a small piece of land from Mexico in 1853, which is now part of southern Arizona and New Mexico.
10.
A Native American tribe originally from Florida, known for their rich culture and history of resisting efforts to be moved from their lands.
