What was the grandfather clause used in southern states supposed to do?

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The grandfather clause was implemented to deny African Americans the right to vote while protecting whites' right to vote. It stated that individuals could only vote if their grandfather had been eligible to vote, which meant that any African American whose grandfather had been a slave and unable to vote was automatically disqualified from voting. This clause was used by southern states to restrict African American voting rights and maintain white supremacy.

What Was the Grandfather Clause Used in Southern States Supposed