I believe the answer is: A.a New York businessman who relocated to Mississippi
Carpetbagger refers to the people who are perceived to take advantage of unstable political situation in the country in order to obtain financial profit. The most likely people who called a carpetbagger are most likely businessman from northern states who tried to explain their influence on the southern states by bringing technological advancement.
They settled in river valleys because they wanted their crops and soil to be rich and eaiser to water their plants.
The Spaniards wanted the land the french wanted the gold
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