American justification of expansion within the continental U.S.was termed what?

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Manifest destiny was a term used to justify American expansionism across the continent during the 19th century. It was the belief that it was America's divine mission to expand its territory and influence, and that it was their duty to spread American values and institutions. This ideology helped shape American policy and the course of history during this time period.

American Justification of Expansion Within the Continental U