Section 1. the right of citizens of the united states to vote shall not be denied or abridged by the united states or by any state on account of race, color, or previous condition of servitude.2why did this amendment require additional enforcement?

The 15th Amendment that granted African-American men the right to vote was adopted in 1870, but despite it, many discriminatory practices were used to prevent African Americans from exercising their right to vote especially in the Southern States.

Because of that, the 15th Amendment had to be enforced with the Voting Rights Act of 1965 as a part of the Civil Rights Movement, this Act outlawed the legal barriers that denied blacks their rights to vote.

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explanation:

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the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.