The rights of African Americans to vote was passed at the 15th amendments. However these rights were fully secured the passage of Voting Rights Act of 1965.
The Voting Rights Act of 1965 is the legal framework passed by the US legislature which prohibits racial discrimination in voting.
Prior to the passage of this right certain discriminatory voting practices were used mainly in the southern states such as literacy test to prevent African Americans from voting. These events happened after the civil war.
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