Final answer:
Manifest Destiny refers to the belief that the United States was fated to expand from the Atlantic to the Pacific. It played a significant role in shaping US foreign policy and was seen as the justification for westward expansion.
Step-by-step explanation:
Manifest Destiny refers to the belief that the United States was fated to expand from the Atlantic to the Pacific. This idea arose in the 19th century and played a significant role in shaping US foreign policy. Advocates of Manifest Destiny saw westward expansion as not only justified, but also inevitable, as they believed it was their nation's destiny to spread democracy, Christianity, and American values.
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