Notably absent from the Fifteenth Amendment, for example, was language prohibiting the states from imposing educational, residential, or other qualifications for voting, thus leaving the door open to the states to impose poll taxes, literacy tests, and other devices to prevent blacks from voting. Other laws revealed themselves as more an assertion of principle than direct federal intervention into Southern affairs, because enforcement required African Americans to take their cases to federal courts, a costly and time-consuming procedure that was a practical impossibility for the vast majority
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