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nado211
The idea of Manifest Destiny, that the United States should control the entire continent from the Atlantic to Pacific Oceans, became possible with the Louisiana Purchase.
JackC25
Manifest Destiny became a popular idea quite after the Purchase, but there is a correlation because with that Purchase, it spurred citizens interest to go out and find new lands to settle and farm. And without this purchase, the U.S. wouldn't have gone so far west with no reason.