What was the impact of literacy tests and poll taxes in georgia?

After the American civil war in 1865,  literacy test and poll taxes had an important impact on the poor and African Americans, who were not allowed to vote in spite of the 15th amendment, which was only address until 1960’s by the federal government. Moreover, poll taxes, a payment required before  voting, kept African Americans from exercising their legal rights.  

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yellow fever and other tropical diseases