Thirty-six of the 48 states were needed to ratify the amendment to the U.S. Constitution before it could become law. Oregon became the 25th state to ratify on January 12, 1920. Finally, on August 18, 1920, Tennessee became the 36th state to ratify. Since the amendment’s adoption, twelve states have symbolically voted for ratification.
June 10, 1919—Illinois
June 10, 1919—Michigan

June 10, 1919—Wisconsin

June 16, 1919—Kansas
June 16, 1919—New York
June 16, 1919—Ohio
June 24, 1919—Pennsylvania
June 25, 1919—Massachusetts

June 28, 1919—Texas

July 2, 1919—Iowa
July 3, 1919—Missouri
July 28, 1919—Arkansas

August, 1919—Montana
August, 1919—Nebraska
September 8, 1919—Minnesota
September 10, 1919—New Hampshire
September 30, 1919—Utah
November 1, 1919—California
November 5, 1919—Maine
December 1, 1919—North Dakota
December 5, 1919—South Dakota
December 15, 1919—Colorado
January 6, 1920—Kentucky

January 6, 1920—Rhode Island
January 12, 1920—Oregon

January 16, 1920—Indiana

January 26, 1920—Wyoming
February 7, 1920—Nevada
February 9, 1920—New Jersey
February 11, 1920—Idaho
February 12, 1920—Arizona
February 16, 1920—New Mexico
February 23, 1920—Oklahoma
March 10, 1920—West Virginia
March 22, 1920—Washington
August 18, 1920—Tennessee
September 14, 1920—Connecticut
February 8, 1921—Vermont

March 6, 1923—Delaware
March 29, 1941—Maryland
February 21, 1952—Virginia
September 8, 1953—Alabama
May 13, 1969—Florida

July 1, 1969—South Carolina
February 20, 1970—Georgia

June 11, 1970—Louisiana
May 6, 1971—North Carolina
March 22, 1984—Mississippi
Events