What was the significance of the term 'Manifest Destiny' in 19th century America?

Manifest Destiny' was a powerful ideology in 19th century America, reflecting the belief that the United States was divinely ordained to expand its territory and influence across North America, from the Atlantic to the Pacific. It provided a moral and ideological justification for territorial acquisitions, whether through purchase, negotiation, or conflict. The term encapsulated the nation's confidence in its purpose, destiny, and place in the world.