A map of the United States showing the progression of suffrage prior to the Nineteenth Amendment of the Constitution, ratified on August 18, 1920. "The map shows the status of women suffrage, or the right of women to vote on an equality with men, on August 1, 1920. The white areas were full-suffrage states; slanting lines indicated Presidential suffrage; squares, primary suffrage; black, no suffrage. A Constitutional amendment to grant suffrage to all women of the United States passed the House of Representatives on May 21, 1919; the Senate, June 4. It was ratified in 1920. By referring to the map the reader may see the progress of the movement." - Foster, 1921.