Worth, during the Mexican-American War.1855. Library of Congress. In 1844, President James K. Polk ran on a Democratic platform that supported manifest destiny, the idea that Americans were ...
They drew up maps, signed treaties and made plans ... Mexico attacked in April 1846, and when the Mexican-American War ended in February 1848, the border we see today began to take shape.
Through the Mexican American War, the U.S. takes a full half of Mexico's territory by 1848. Over seventy thousand Mexicans are caught in a strange land and many become American citizens.
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