Why did the united states fight a war with mexico

The Mexican–American War, also known as the Mexican War, the U.S.–Mexican War or the Invasion of Mexico, was an armed conflict between the United States of America and the United Mexican States from 1846 to 1848. It followed in the wake of the 1845 US annexation of Texas, which Mexico considered part of its territory, despite the 1836 Texas Revolution.

Ais your answer

The tried to make the government smaller by making the government smaller