to be the first war in foreign soil. The American army had good benefits as well as bad but one good benefit they had is that when they went into this war, the Mexican’[s were unprepared in so many ways. Such as military order and many other things. The American army had more skills into fighting and were well prepared unlike the Mexican army. During this period The United States President was James K. Polk. President Polk had many strong beliefs, his strongest one was “manifest destiny” that would spread a border from the continent to the Pacific ocean. The American army fought for this to be done and along with the land for the borders along the side “ The Rio Grande” , The United states gained Texas,California, Utah, Colorado, Wyoming, New Mexico and Nevada in 1835 these lands were part of Mexico but not anymore.
This war had many leading causes, such as in 1836 The Land/Sate of Texas decided to be independent from their native land owners, Mexico. Texas wanted to be part of the united states union but on purpose the U.S decided not to bring them into their union.