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For the United States, the effects of Manifest Destiny were pretty positive. The main impact was that the United States got much larger and much wealthier. ... For others, Manifest Destiny had more negative effects. For the Native Americans and for Mexico, it meant losing their land.

How did the policy of Manifest Destiny aggravate already-existing tensions in the United States?

The Manifest Destiny played a significant role in American policy. It contributed to peace talks with Britain on control of the Oregon Territories. Manifest Destiny has pushed the United States to conquer Mexico and eventually capture a large portion of the West during the victorious Mexican Revolution.

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