People disagree whether the United States should have gone to war against Mexico. Should the United States have declared war? The United Statebecause. A second reason is.

1- The addition of Texas added to the happening to the Mexican-American War  

2- The contention began, to a limited extent, over a contradiction about which waterway was Mexico's actual northern fringe: the Nueces or the Rio Grande  

Explanation:

The fundamental driver of the war was the affirmation of Texas into the United States of America. Since Mexico didn't perceive Texas' freedom after their effective resistance to the Mexican government it was viewed as an intrusion into Mexican domain once Texas acknowledged the greeting into the United States.

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