Manifest Destiny was the belief that

Aslavery should extend westward beyond the South
Bthe United States should invade and capture all of Mexico
CNative Americans had a right to the land they lost.
Dthe United States should own most or all of North America

Verified Answer :

In the United States, Manifest Destiny was the belief that "D. the United States should own most or all of North America", since its proponents wanted the US to spread from the Atlantic to the Pacific.