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savannahmerryman
In the mid-1800s, Democrats believed that a policy of Manifest Destiny meant that the United States was "destined" to expand all the way to the Pacific Ocean--which they used to justify many wars and to remove Natives from their land. 

Answer:

Would boost the American economy and open up economic opportunities, is the right answer.

Explanation:

Manifest destiny was a publicly sustained faith in the United States during the 19th century. With this manifest immigrants were intended to expand over North America. Democrats used this term in the decade of 1840's to defend the war with Mexico. Moreover, they used this belief to apportion half of Oregon with Great Britain. They strongly believed that this policy of manifest would boost the American economy and open up economic opportunities.

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