Manifest Destiny

Manifest Destiny is a term attributed to journalist John L. O’Sullivan to describe the controversial belief that the United States was pre-ordained to expand to the Pacific ocean. It was used during the first half of the 19th century to justify the war with Mexico, claim the Oregon Country, and expel American Indians from their ancestral homelands. Manifest Destiny was complicated by the controversy surrounding the expansion of slavery into new states and territories.

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