Answer:it’s D
Explanation: It’s D because in the 17th amendment people vote directly for senators.
The cause is what caused (something) to happen
The effect is what happened because of the Cause.
A is the cause B is the effect...
since they had to vote in the articles of confederation
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Those who opened farms and needed the workforce realized how the system was bad for them and how they needed to find a new way to get workers, that is slaves. The local Native Americans started dying out because of disease and were often hostile so it was difficult to enslave them, which caused problems for farms. The indentured servants would go away after a while when their debt was paid so they were not good in the long run. Africans could easily be bought as already slaves on the western coast of Africa and were cheap and strong which meant that slavers could easily get a bunch of them and just replace them if they die or anything similar.