How did passage of this legislation affect the political process in the United States?

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It enforced the Fifteenth Amendment, protecting the right of racial minorities to vote
It enforced the Nineteenth Amendment, protecting the right of women to vote
It extended suffrage to U.S. citizens, allowing 18-year-olds to vote.
It extended suffrage to U.S. citizens, allowing 21-year-olds to vote

It extended suffrage to U.S. citizens, allowing 18-year-olds to vote.