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U.S. Expansion 7-4.3
United States Expansion
| Term | Definition |
|---|---|
| Monroe Doctrine | Warned Europeans not to build any new colonies in the Americas. |
| annex | To take control of. |
| isthmus | A narrow strip of land that connects to bigger land masses. |
| lock | A section of a canal that can be opened and closed to control the water level. |