President James K. Polk ran on a Democratic platform that supported manifest destiny, the idea that Americans were supposed to live in the entire North American continent. The last act of the president John Tyler, the one before Polk was to annex the Republic of Texas in 1845. Polk wanted to claim California, New Mexico, and land near the unclear southern border of Texas. Still, Mexico was not so eager to let go of these territories. Polk started by trying to buy the land. He sent an American…
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