What concept applied in the U.S.during the 1800s was used to justify westward expansion into the "unused land" in North America?

Question

What concept applied in the U.S.during the 1800s was used to justify westward expansion into the "unused land" in North America? ​

Quizplus · Accepted Answer

Manifest Destiny was the concept that it was the destiny of the United States to expand its territory and spread its values and institutions across North America, from the Atlantic to the Pacific Ocean. This idea was used to justify the westward expansion and acquisition of territory from Native American tribes, Mexico, and other countries. The belief in Manifest Destiny was popular during the 1800s, particularly during the era of territorial expansion and the settlement of the American West.

What Concept Applied in the U