Though my father is from Canada, he held all Canadian alcohol products in disdain.
(Now this a the story he passed down to me, so there may be elements that don't bear scrutiny.)
Ontario had a prohibition on from 1916-1927 which of course overlapped the first 8 years of the US prohibition. But alcohol was a big business and the laws were such that only retail sales and consumption were outlawed. Manufacture and "export" were still allowed. Several, probably numerous, companies, such as Seagrams and CC, "exported" their products across the Detroit River to the US once our Prohibition kicked in.
Because these were legit Canadian companies, the story goes that they struck deals to supply the US hotel industry all during Prohibition. Of course the US upper class preferred to stay at hotels that could provide their patrons with "product" and hence big money was made by connected hotel chains in those days. The Canadian government turning their back on the illegalities of this "export". Canadian distillaries also supplied quite a bit to organized crime and contributed to the rise of the Mafia in the US. Detroit was a major mob town because of this convenient supply of product just across the river.
If it hadn't been for US Prohibition many of the Canadian brands that are now large, respected distillers would have remained small regional suppliers of no particular note.
And that's Dad's story.