How did Mexico influence the American Civil War?

Question: How did Mexico influence the American Civil War!?
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Two ways:
After the conclusion of the Mexican war the Federal Government of the United States gained a vast territory of 1!.36 million squares kilometers which include the present day states of Arizona, Nevada, California, Utah, parts of New Mexico, Colorado and Wyoming!. This acquisition revived the question of whether these new States would be slave or free!.
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The Mexican War was a valuable training ground for American officers, many of whom would later serve in the Civil War!. When Lee met Grant at Appomattox in April 1865, they had a friendly conversation about service in Mexico!.
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