They moved out of the foothills and into the plains (near rivers). The rivers provided more opportunities for food growth.
D. International consumers have never cared for working conditions
Most of them have to move to new places.
Farmers is the answer you are looking for!
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xo ♥ -Cote
Remember that at the Constitutional convention, states with large populations clashed with states having small populations. The issue was over representation in Congress.