History timeline (1914 - 1929) By Tiago0095 Jan 1, 1920 Start of WW1 (-2) Feb 1, 1920 Automobile (+2) Mar 1, 1920 Discovery of insulin (+2) Apr 1, 1920 The KKK (-2) May 1, 1920 Telephone and Radio (+2) Jun 1, 1920 Sexual sterilization act (-1) Jul 1, 1920 Chinese exclusion act (-1) Aug 1, 1920 Battle of Vimy Ridge (+1) Sep 1, 1920 Indian act (-1) Oct 1, 1920 Arts and entertainments (+1)
