After Texas gained its independence from Mexico in 1836, the U.S. was hesitant in deciding whether it was the right decision to admit Texas into the union or not. This was because they understood that any form of annexation would lead to war between Mexico and the United States. Although they understood the potential consequences, the United States either way admitted Texas into the union bringing then debates on territorial boundaries and the definition of the new territory as a slave state or free state. The Mexican American War was a war fought on foreign soil between the United States and Mexico because they were in disagreement over where the Mexican-American border should be after the annexation of Texas. This war marked a turning point
