Final answer:
The Mexican-American War was caused by the annexation of Texas and the concept of Manifest Destiny, leading to territorial disputes and conflict with Mexico.
Explanation:
Two factors that led to the Mexican-American War were:
- Annexation of Texas: The annexation of Texas by the United States in 1845 caused tensions with Mexico, as Mexico did not recognize Texas as an independent nation.
- Westward Expansion: The idea of Manifest Destiny, the belief that the U.S. was destined to expand across the continent, fueled territorial ambitions that led to conflicts with Mexico over land boundaries.
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