Which of the following changes in westward migration is most likely to have occurred in the 1840s?(A) The number of pioneers headed for the Oregon territory decreased while the number headed for California greatly increased.(B)The first great wave of migration ended, and the number of migrants remained extremely low until after the Civil War.(C)For the first time, pioneers began to settle areas west of the Mississippi River.(D)Large numbers of free Black people, unwelcome in the East, began to resettle in the West.

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