Which amendment granted women the right to vote in 1920?

The 19th Amendment is the correct amendment that granted women the right to vote in 1920. This significant piece of legislation marked a crucial victory in the women's suffrage movement, which sought equal voting rights for women. The ratification of the 19th Amendment allowed women to participate in elections, significantly changing the political landscape of the United States.

In context, the 15th Amendment, ratified in 1870, addressed voting rights for African American men but did not extend suffrage to women. The 21st Amendment, ratified in 1933, repealed Prohibition and is unrelated to voting rights. The 24th Amendment, ratified in 1964, abolished poll taxes in federal elections but came much later and similarly does not pertain to women's suffrage. Thus, the 19th Amendment directly relates to the enfranchisement of women, representing a pivotal advancement in American democracy.