It fell on the month, may
Some common problems they faced is that they both expanded their lands and had trouble controlling the old and new territories.
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Answer:
The Mexican army attacked them. The main cause of the war was the westward expansion of the United States. 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.
Explanation:
