Final answer:
Manifest Destiny was the belief that Americans had a duty to expand westward, shaping U.S. expansion. Policies like the Louisiana Purchase and the Indian Removal program supported the government's encouragement of westward movement.
Explanation:
Manifest Destiny was the belief that it was the duty and destiny of Americans to continue to move westward and conquer all the land between the Atlantic and Pacific Oceans. This idea emerged in the 19th century, promoting the expansion and control of the North American continent. The government encouraged westward movement through policies such as the Louisiana Purchase and the Indian Removal program under Jackson.
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