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When slavery was abolished at the end of the Civil War, southern states created black codes, laws which aimed to keep white supremacy in place.
Black codes attempted to economically disable freed slaves, forcing African Americans to continue to work on plantations and to remain subject to racial hierarchy within the southern society.
Black codes gave rise to a new wave of radical Republicanism in Congress, and the eventual move towards enshrining racial equality into the Constitution. However, black codes also set precedent for Jim Crow laws.
Jim Crow laws—sometimes, as in Florida, part of state constitutions—mandated the segregation of public schools, public places, and public transportation, and the segregation of restrooms, restaurants, and drinking fountains for whites and blacks. The U.S. military was already segregated.
Southern state legislatures employed literacy tests as part of the voter registration process starting in the late 19th century. Literacy tests, along with poll taxes, residency and property restrictions and extra-legal activities (violence, intimidation) were all used to deny suffrage to African Americans.
The tax emerged in some states of the United States in the late 19th century as part of the Jim Crow laws. After the right to vote was extended to all races by the enactment of the Fifteenth Amendment to the United States Constitution, a number of states enacted poll tax laws as a device for restricting voting rights.
LONG STORY SHORT THE SOUTH DID EVERY THING THEY COULD TO HOLD BACK THE AFRICAN AMERICAN POPULATION