Answer: Manifest Destiny brought money, land, resources, and a strengthened economy to the Americans. ... This idea that it was their destiny to expand caused Americans to disregard the territorial rights of Native Americans, wiping out many tribes and causing a cultural divide, tension and wars. With its triumph in the Mexican-American War, the United States seemingly realized its Manifest Destiny by gaining an immense domain (more than 525,000 square miles [1,360,000 square km] of land), including present-day Arizona, California, western Colorado, Nevada, New Mexico, Texas, and Utah.4
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