Which amendment to the U.S. Constitution granted women the right to vote?

The amendment that granted women the right to vote is the 19th Amendment. Ratified in 1920, this significant constitutional change marked a culmination of decades of activism by women's suffrage groups who campaigned for equal voting rights. Prior to its passing, women faced systemic barriers and legal restrictions that prevented them from participating in elections and civic life. The 19th Amendment represented a monumental shift in American society, acknowledging the essential role of women in the democratic process and promoting the principle that voting rights should not be limited by gender.

The other amendments listed do not pertain to women's voting rights. The 15th Amendment, ratified in 1870, prohibited denying the vote based on race but did not include gender. The 18th Amendment, enacted in 1919, established Prohibition, banning the manufacture, sale, and transportation of alcohol. The 21st Amendment, ratified in 1933, repealed Prohibition. Therefore, the 19th Amendment is the correct choice for the question regarding women's suffrage.