Which of the following was one cause of the Mexican-American War? (1 point)
Mormons moved into Mexican territory.
The United States annexed Texas.
President Polk purchased Texas.
Mexico offered to sell California
The United States annexed Texas.
The annexation of Texas by the United States in 1845 was one of the primary causes of the Mexican-American War. After gaining independence from Mexico in 1836, Texas operated as an independent republic. The U.S. annexation of Texas led to a diplomatic crisis with Mexico, which still considered Texas as part of its territory despite the Texan victory in the Texas Revolution. Mexico had warned that annexation would be considered an act of war. When Texas became a U.S. state, tensions escalated, eventually leading to the outbreak of hostilities between the two nations in 1846.