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Austria-Hungary fought with Serbia. As allies of Austria-Hungary, Germany joined the war against Serbia but Serbia allied with Russia.
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The Business Profits War Tax of 1916 and the Personal Income tax of 1917 was introduced by the government to fund the war.
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The War Measures Act was passed, allowing authorities to imprison those who were born in enemy countries in internment camps.
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The government implemented the Military Service Act, making it mandatory for men between 20-45 years of age to enlist in WW1.
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Women earned the right to vote in 1918.
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Germany signed an armistice agreement with the Allies in 1918.
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After the war it became illegal to produce or sell alcohol.
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In 1920 the government amended the Indian Act making it mandatory for all Indigenous children to attend Residential Schools.
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In 1922 Frederick Banting and his colleague Charles Best discovered Insulin.
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In 1929 women were legally included in the definition of 'persons' this gave women the right to be appointed to the Senate of Canada.