How did the Voting Rights Act expand the ability of Americans to vote?
It made barriers like poll taxes and literacy tests that targeted African Americans illegal.
It required voters to present photo identification before voting in any federal election.
It enforced a rule that federal ballots only be printed in English in every official election.
It mandated that states require all high school seniors to register to vote upon graduation.

The Voting Rights Act made barriers like poll taxes and literacy tests that targeted African Americans illegal.

Explanation:

The Voting Rights Act of 1965 is a federal law designed to ensure the equal participation of minorities, especially African Americans, in elections.

Specifically, it abolished discriminatory illiteracy tests for potential voters, banned Gerrymandering if it discriminated against minorities, centralized federal voter registration in areas where less than 50 percent of the population were registered voters, and gave the Department of Justice various control over that Electoral law in areas where African Americans make up more than five percent of the population.  

The law passed both houses of Congress with a large majority, and was signed by then President Lyndon B. Johnson on August 6, 1965.

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the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.