The manifest destiny was the thought that we had the god given right to expand the U.S.A, and so how the war helped achieve this thought was that on February 2, 1848, the treaty was signed in Guadalupe Hidalgo. It called for Mexico to cede 55 percent of its territory, including what is now Arizona, California, New Mexico, and Texas, and parts of Colorado, Nevada, and Utah, in exchange for fifteen million dollars in war compensation. This made it so that we have more land helping to achieve the thought of manifest destiny.
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