In addition to official restriction white southerners blocked Africa American from voting by

In addition to official restrictions, white Southerners blocked African Americans from voting by offering to end segregation. using violence and threats. secretly changing election dates. bribing them to stay away from polls.

Threatening voters, physically removing them from the polls, and stuffing ballot boxes.

Explanation:

Some other "unofficial" restrictions included poll taxes, literacy tests, and the grandfather clause. But since this question was vague, I assumed you meant the things that weren't put into law

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