Which reason did the United States give for declaring war against Mexico in 1846?

the United States and Mexico went to war cause of the Westward Expansion

Explanation:

All through the 19th century Americans believed it was their right to expand westward. At the time they believed they could conquer the people already living on the land and take it for the United States.

To defend U.S territory from Mexican aggression.

Explanation:

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both the house and senate must approve the conference report.   after it is approved by both on an identical from, it will be sent to the president.   if the president approves it, it will become law.

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