Which constitutional amendment granted women the right to vote?

The 19th Amendment to the United States Constitution granted women the right to vote, ensuring that voting rights could not be denied on the basis of sex. Ratified in 1920, this amendment marked a significant milestone in the women's suffrage movement, which sought to secure equal voting rights for women across the country. The amendment's passage was the result of decades of activism and advocacy by women who argued for their right to participate fully in the democratic process. It represented a major step towards gender equality in the legal framework of the United States, enabling women to engage in civic duties and influence legislation.

The other amendments mentioned do not address women's suffrage. The 15th Amendment, for instance, aimed to protect the voting rights of African American men, while the 24th Amendment eliminated poll taxes in federal elections, and the 26th Amendment lowered the voting age to 18. Each of these amendments played an important role in expanding voting rights but did not specifically grant women the right to vote, which is why the 19th Amendment is the correct answer.