What organization supported a constitucional amendment to grant women the right to vote

The National Woman Suffrage Association supported a constitutional amendment to grant women the right to vote.

Answer: The National Woman Suffrage Association supported a constitutional amendment to grant women the right to vote and this organization is formed to work for women's suffrage in the United States. In the Nineteenth Amendment to the constitution of United States gave women the right to vote, before this women were not allowed to give vote.