Why did this amendment require additional enforcement

The answer is D. Southern states created loopholes to prevent African americans from voting.
Sourthen state created loopholes to prevent African American from voting is amendment require additional enforcement.
An amendment is a change or addition to a constitution, legislation, legislative bill, or resolution in government and law.
Existing constitutions and statutes can be altered, and bills are regularly amended during their legislative journey.
Thus, option D is correct.
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