Which amendment to the Constitution granted women the right to vote?

The 19th Amendment to the United States Constitution is significant because it explicitly granted women the right to vote. Ratified in 1920, this amendment marked a pivotal moment in American history as it legally prohibited any United States citizen from being denied the right to vote on the basis of sex. This amendment was the culmination of decades of activism and advocacy led by women suffragists, who fought for equal voting rights alongside their male counterparts.

In contrast, the other amendments listed do not relate to women's suffrage. The 15th Amendment addresses voting rights regardless of race but does not include gender. The 21st Amendment is known for repealing Prohibition, and the 26th Amendment lowered the voting age to 18. Therefore, the correct choice clearly points to the legal change that secured voting rights specifically for women.