This photo depicts the historic moment when Tennessee became the 36th state to ratify the 19th Amendment, thereby making it law.
The Tennessee State Library and Archives, where the original document is maintained, describes the image as follows:
This photograph from the "Ratification Issue" of the Nashville Tennessean, Sunday morning, August 29, 1920, depicts the Senate chamber at the moment that the clerk counted the historic vote on women's suffrage.
Women flood the gallery and floor as the clerk counts the votes. Young Senator Harry T. Burn from McMinn County cast the deciding vote for the 19th Amendment. With this vote, Tennessee became the 36th and deciding state to approve the 19th Amendment to the U.S. Constitution, granting women the right to vote.
Image online, courtesy Tennessee State Library and Archives, Library Collection.