Causes Of Manifest Destiny

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As defined by John L. O'Sullivan, Manifest Destiny was the doctrine that America had been divinely apportioned land on the North American continent as a result of the country's rapid population growth. This population multiplication could be attributed directly to the American values of God-given rights, liberties, and its representative republican form of government. Expansion west would give breathing room to Americans in exchange for extending a free government to those who were willing to accept it. Inevitably, expansion caused conflict with existing nations, notably Mexico. In 1846, Mexico attacked U.S. forces in a disputed zone in Texas and America declared war. By 1848, the U.S. controlled western lands all the way to the Pacific coast.

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