To meet the American demand for livestock, the Comanche turned to raiding the area around San Antonio. The Spanish government believed that security would come with a larger population, but was unable to attract colonists from Spain or from other New World colonies.
The Mexican-American War was in the period 1846-1848. The main causes of the Mexican-American War were mainfest destiny (Americans believed that thye have the right to expand westward and conquer territory despite the rights of the indigenous people already living on that land), westward expansion, economics, and slavery
