Which amendment granted voting rights to women in the United States?

The 19th Amendment is significant because it specifically granted women the legal right to vote in the United States, ensuring that the right to vote could not be denied on the basis of sex. Ratified on August 18, 1920, this amendment represented a pivotal victory in the long struggle for women's suffrage and marked a critical moment in the broader movement for gender equality in the United States.

Prior to the 19th Amendment, women faced various legal and societal barriers that prevented them from participating in elections. The successful enactment of this amendment symbolized a shift toward recognizing women’s rights and paved the way for increased political involvement and representation.

The other amendments listed do not pertain to women's voting rights; thus, they do not address the question directly. The 18th Amendment dealt with prohibition, the 20th Amendment focused on the terms of office for Congress members and the President, and the 21st Amendment repealed prohibition established by the 18th Amendment.