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Prohibition was introduced in 1918 to help the war effort and ended in 1920. American Prohibition continued years after this, though, and Canadians made a lot of money smuggling alcohol to the USA during this time.
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On February 1st, 1920, the Dominion Police was joined with the North-West Mounted Police to form the Royal Canadian Mounted Police.
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Canadian industry started to heavily rely on American products, and American factories were built in Canada. Canada put tariffs on American products.
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During the 1920s, Quebec affairs became increasingly English dominant. Abbe Groulx, noticing this pattern, started to write and advocate for the political independence and possible separation of Quebec.
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Insulin was discovered by three researchers, Fredrick Banting, J.R Macleod, and James Collip in 1921. This significantly helped to treat and maintain control diabetes in patients.
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Agnes Macphail was elected to Parliament in 1921, after women were granted the vote. She campaigned for marginalized groups and was heavily criticized for it.
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Canada refused to go fight on the British Front without the parliament agreeing, and it took so long that the fight had ended before Canada made a decision. This is the start of Canada's independence.
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Canada made a deal with America to both have a fishing season where Halibut stocks were low and a penalty for fishing during the off-season. Politicians argued that this wasn't a matter for Britain to handle as it was between the US and Canada.
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Made by Edward Samuel Rogers (who his son later started the Rogers company), the first battery-less radio tube was meant to be plugged into sockets at home.
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After a 25 year boundary dispute with Canada, Newfoundland was awarded with Labrador. The colony became Newfoundland and Labrador.