Women in the United States were granted the right to vote with the ratification of the 19th Amendment to the U.S. Constitution. The amendment was passed by Congress on June 4, 1919, and was ratified on August 18, 1920. This amendment legally guaranteed women the right to vote across the nation. Before this, voting rights for women had been granted in various states and territories starting from the late 19th century, but the 19th Amendment established this right nationwide. However, it's important to note that while the 19th Amendment granted voting rights to women on paper, many women of color, especially Black women in the South, continued to face significant barriers to voting due to discriminatory practices until the Voting Rights Act of 1965 addressed many of these issues.