The Battle of the Alamo (February 23 – March 6, 1836) was a crucial conflict of the Texas Revolution. In 1835, colonists from the United States joined with Tejanos (Mexicans born in Texas) in putting up armed resistance to the centralization of the Mexican government. President Antonio López de Santa Anna and the government in Mexico City believed the United States had instigated the insurrection with a goal of annexing Texas.