Which of the following was one cause of Mexican-American war?

Mormons moved into Mexican territory
President Polk purchased Texas
United States annexed Texas
Mexico offered to sell California

1 answer

The correct answer is: United States annexed Texas.

The annexation of Texas by the United States in 1845 was a significant factor that contributed to the outbreak of the Mexican-American War. Mexico viewed the annexation as an act of aggression since it still considered Texas to be part of its territory.