30. What doctrine did the Supreme Court enunciate in the Slaughterhouse cases of 1873?(A) Where civil courts were functioning, civilians could not be tried by military courts orcommissions(B) Congress had the power to ensure each state a republican form of government(C) The federal government was obliged to protect only basic rights of national citizenship, and it did not have to protect rights against state violation(D) The Fifteenth Amendment did not confer the right of suffrage upon anyone(E) Congressional reconstruction governments were unconstitutional because they had beenforced upon the South

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