2. What played a role in the disagreement between the U. S. and Mexico?

The Mexican-American War

Explanation:

The Mexican-American War was a conflict between the United States and Mexico, fought from April 1846 to February 1848.It had stemmed from the annexation of the Republic of Texas by the U.S. in 1845 and from a dispute over whether Texas ended at the Nueces River (the Mexican claim) or the Rio Grande, The United  States Claim.

- "made the south's economy grow rapidly and a small effect that a lot of people don't know is that it made the more demand of slaves and cotton products. and also new states formed due to plantations growing in size."

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