The voters of michigan, oklahoma and the Federal enclave of South Dakota pass state-wide referenda extending voting rights to women. This makes them the 13th, 14th and 15th states to extend the franchise to women—without amending the Constitution for the united States.
[restored 6/18/2022]
Subsequent Events:
Authority:
michigan constitution of 1908, article XVII, section 2
www.legislature.mi.gov/documents/historical/miconstitution1908.htm
oklahoma constitution, article XXIV, section 3
oksenate.gov/sites/default/files/2019-12/AllOKConstitutionArticles.pdf
south dakota constitution, article XXIII, section 3
sdlegislature.gov/Statutes/Constitution/2030310
References:
What Michigan women can learn from fight for suffrage 100 years ago
www.lansingstatejournal.com/story/news/local/capitol/2018/01/21/centennial-michigan-womens-suffrage/1017344001/
Oklahoma Woman’s Suffrage Association | The Encyclopedia of Oklahoma History and Culture
www.okhistory.org/publications/enc/entry.php?entry=OK089
South Dakota Women’s Suffrage (1918) – Ballotpedia
ballotpedia.org/South_Dakota_Women%27s_Suffrage_(1918)