history

Start of WWI

Jan 1, 1914

-2
Political

Conscription

Jan 1, 1915

-1
Political

Chinese exclusion act

Jan 1, 1916

-1
social

battle of somme

Jan 1, 1917

0
political

jazz

Jan 1, 1918

+1
social

vimy ridge

Jan 1, 1919

+1
political

Agnes macphail

Jan 1, 1920

+1
social

Telephone/radio

Jan 1, 1921

+1
economic

insulin

Jan 1, 1922

+2
social

end of WWII

Jan 1, 1923

+2
political