Western Expansion, Manifest Destiny, and the Mexican-American War

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How did Manifest Destiny impact American foreign policy?

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Manifest Destiny played a huge role in American foreign policy. It led to treaty negotiations with Britain over the ownership of the Oregon Territory. Manifest Destiny also led the United States to invade Mexico and then seize much of the West after the successful Mexican War. Manifest Destiny also led to the United States attempting to buy Cuba from Spain before the Civil War; Spain turned down the offer. All of these actions took place before the Civil War as Americans moved West in search of mineral wealth and cheap farmland. They also considered it their God-given right to possess North America. Many Southern planters wanted to extend Manifest Destiny into the Caribbean in the form of plantation culture.

After the Civil War, Manifest Destiny continued to be a driving force in foreign policy. The United States bought Alaska from Russia in 1867; this was the first move that the United States made where the territory was not connected to other American territories of the time. Manifest...

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