Which of the following groups was granted the right to vote by the Nineteenth Amendment?

The Nineteenth Amendment to the United States Constitution, ratified in 1920, specifically granted women the right to vote. This landmark amendment was a significant victory in the women's suffrage movement, which advocated for the enfranchisement of women who had been denied this basic democratic right for much of U.S. history. By affirming that the right to vote cannot be denied on the basis of sex, the amendment marked a pivotal change in the landscape of American voting rights, expanding participation in the electoral process and contributing to greater gender equality in civic engagement.

The other groups mentioned in the answer choices relate to different civil rights developments in U.S. history. For instance, African American men had theoretically achieved voting rights with the Fifteenth Amendment in 1870, although they faced significant barriers, particularly in southern states, due to segregation and discriminatory practices. Citizens over eighteen were granted the right to vote with the Twenty-sixth Amendment, ratified in 1971. The phrase "all citizens" does not accurately reflect the specific focus of the Nineteenth Amendment, which distinctly recognized women's rights, rather than the broader category of all citizens.