I believe the correct answer to be D but it could also be A
Sand dunes are formed by wind.
Explanation: Dunes form when wind blows sand into a sheltered area behind an obstacle.
First, American troops would drive
Mexican forces out of the disputed border
region in Texas and make the border
secure. Then, the U.S. would
seize New Mexico and California. Finally,
American forces would take Mexico City,
<span>the capital of Mexico.
I put the final step in bold :) Hope this helps
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