Why are poll taxes illegal in the United States in a short paragraph explain how poll taxes or an obstacle that takes voting rights away from poor citizens

Poll taxes were first created with the intention of keeping African Americans from voting. Lots of racial problems were being brought to light during these times. Most African Americans were paid very little and many could not afford to vote due to the poll taxes. It takes voting rights away from poor citizens because many were unable to vote due to not being able to afford it.