Which amendment granted women the right to vote?

The 19th Amendment is significant because it explicitly states that the right to vote cannot be denied or abridged on the basis of sex. Ratified in 1920, this amendment was the culmination of a long struggle by women's suffrage advocates who fought tirelessly for women's rights in the United States. Before the ratification of the 19th Amendment, many women were denied the opportunity to vote, and the amendment marked a pivotal moment in American history as it expanded democratic rights and promoted gender equality.

In contrast, the other amendments listed address different issues: the 15th Amendment focuses on voting rights regardless of race, the 21st Amendment repealed Prohibition, and the 24th Amendment outlawed poll taxes in federal elections. None of these amendments pertain to women's suffrage, making the 19th Amendment the correct choice in this context.