Which amendment granted women the right to vote?

The Nineteenth Amendment to the United States Constitution is the key legislation that granted women the right to vote. Ratified in 1920, this amendment prohibited any U.S. citizen from being denied the right to vote on the basis of sex. This landmark change was the culmination of the women's suffrage movement, which aimed to secure equal voting rights for women, highlighting the ongoing struggle for equality that characterized that era.

The other amendments listed do not pertain to voting rights for women. The Fifteenth Amendment, ratified in 1870, prohibited the denial of the right to vote based on race, color, or previous condition of servitude, focusing specifically on protecting the rights of African American men. The Eighteenth Amendment established Prohibition, making it illegal to manufacture, sell, or transport alcoholic beverages, and had no direct relation to voting rights. Lastly, the Twenty-fourth Amendment, ratified in 1964, removed poll taxes in federal elections, which were fees charged to vote and often used to disenfranchise low-income and minority voters, but it did not specifically grant voting rights to women.

Thus, the Nineteenth Amendment is the correct answer as it directly and explicitly ensures voting rights for women.