What did nineteenth-century American expansionists mean by the term Manifest Destiny?

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The term Manifest Destiny referred to the belief that the citizens of the United States had a divine right to expand their territory and to conquer the land from the Atlantic to the Pacific Ocean. This belief was rooted in the idea of American exceptionalism, which held that the United States was uniquely destined by God to spread its democratic values and institutions across the continent.

What Did Nineteenth-Century American Expansionists Mean by the Term Manifest