It is absolutely ethical to charge those with lower incomes less money, and those with higher incomes more money.
Domestic tranquility is basically the people being happy with the country and not being in danger. They were concerned about it because without it, it could lead to revolts and revolutions.
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The question is asking to choose among the following that is the revoked of southern blacks' civil rights, base on my research and on my further investigation, I would say that the answer would be letter <span>b. Civil Rights Act of 1875. I hope you are satisfied with my answer and feel free to ask for more </span>