18th Amendment By Cameron9725 Dec 18, 1917 18th amendment was proposed by congress Period: Dec 18, 1917 to Dec 5, 1933 18th Amendment https://www.youtube.com/watch?v=45R6SDrJgiY Jan 18, 1918 the first of the 36 states (three-fourths of the 48 states) required to ratify it for inclusion in the Constitution Jan 16, 1919 18th Amendment was ratified Period: Jan 16, 1919 to Dec 5, 1933 Organized crime became abundant in these years. https://www.youtube.com/watch?v=y4BDnlUQ3CA Jan 17, 1920 The nation’s new law prohibiting alcohol commenced as mandated 1925 It became obvious the prohibition was not doing its job Feb 20, 1933 The 21st amendment was proposed Mar 10, 1933 Michigan became the first state to ratify the Twenty-first Amendment Dec 5, 1933 The 21st Amendment was ratified, Canceling out the effects of the 18th amendment