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It was a belief that the USA was "destined" to control the North America. In practice, it was a convenient way of justifying rapid US expansion in the XIXth century.
Manifest Destiny was the 19th century American belief that the United States was destined to expand across the North American continent, from the Atlantic Seaboard to the Pacific Ocean. It was used by Democrats in the 1840s to justify the war with Mexico; the concept was denounced by Whigs, and fell into disuse after the mid-19th century.