The correct option is A belief that the growth of the United States was a certainty.
Manifest Destiny was an ideology of expansion across the continent. Some even wanted to annex Canada and Mexico. It affected the US because the idea drove the expansion, annexation, and active movement toward the west.
With Manifest Destiny, most Americans got some chances to move, explore, and discover new places other than their usual community, and this was very beneficial in so many ways. The exploration is great for personal gain, socially, spiritually, and emotionally and economic improvement.
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