How were Black People prevented from voting despite the 15th amendment?

Though the
1870 Amendment to the U.S. Constitution granted African American men the right to vote,
mechanisms like literacy tests and poll taxes prevented many from doing so. Moreover, employers,
white mobs, and organizations like the Ku Klux Klan used threats and intimidation to keep
African American men from the polls.

In Mississippi, for example, a poll tax
had to be paid two years before a scheduled election per the state's Constitution; this
prevented many from voting. Literacy tests included tasks such as reading a part of the state's
Constitution and explaining it to the county clerk, at whose discretion the prospective voter
would be deemed literate or illiterate. Literacy tests for white men were generally much
simpler, to assure their success.

Some states required voters to own
property, and fewer African Americans than whites were able to meet this requirement. Some
states did not allow anyone who had been arrested to vote, and often, African Americans were
arrested on trumped-up charges for this reason. And lastly, some states would occasionally purge
the lists of registered voters, only allowing re-registration after an important
election.

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