Which of these had the most direct impact on the native americans of the great plains? a. the u. s. victory in the mexican-american war b. the hunting of the buffalo to near extinction during the 19th century c. the migration of emancipated slaves to the west during reconstruction d. the rise in immigration from southern and eastern europe at the end of the 19th century

D. the rise in immigration from southern and eastern europe at the end of the 19th century

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the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain