The answer is the third one

An urban area is the answer.

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With the cotton grin, cotton became much more worthwhile crop because ratio output quantity decrease a lot more. also the plantation owner can make a more money or a larger profit on the use of slavery workers.
I believe the answer is: whether the Supreme Court could hear the case.
At that time, President Nixon wanted to use his Executive previlege to avoid the supreme court from hearing his case and argued that it's all for the sake of national security. The court ruled against nixon and ordered him to hand over the tape which lead to his impeachment during the watergate scandal.