Final answer:
Manifest Destiny was the belief in the U.S. mission to expand westward, spreading democracy, illustrated by acquisitions and conflicts in the 19th century.
Explanation:
Manifest Destiny was the belief that the United States had a divine mission to expand westward, spreading democracy and transforming the continent. This concept justified American expansion across the United States, leading to acquisitions like Texas and Oregon. It also played a role in conflicts such as the U.S.-Mexican War.
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