Hoolie
Answered

What was the source of the conflict between the United States and Mexico before they went to war?

Verified Answer :

meerkat18

It was caused by a border dispute.  Mexico never recognized Texas
independence.  They claimed that the Rio
Grande was still part of Mexico.  This
further aggravated when President Polk sent troops to the Nueces River as the
expedition to California by John Fremont.  

nbadorrian

Answer:

C.)The United States and Mexico disagreed about the US southern border.

Explanation:

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