What was the cause of the mexican american war

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

President Polk’s desire for the US to control ports in California

Explanation ;  Polk attempted to buy territory (including California) from Mexico. He was refused, so he ordered US military forces into a disputed area hoping to provoke a war

rescuing someone who is in danger. hope this : )