The world was a lot smaller then and distribution more difficult. There were also post-war prohibitions that saw Canada get different products - the US was focused on rebuilding it's own industry and fostering Japan; because the Canadian market is so small compared to the US, it was often not considered worth the effort.
Canada got a lot of stuff from the UK, Germany and even Taiwan the US didn't get but didn't get US made gear by Danelectro, Harmony, Kay, Valco and etc. - most of those were distributed through the catalog re-sellers like Montgomery Ward that weren't in Canada. Sears was the only big US cataloger in Canada. Eaton's and the Hudson's Bay had their own line of electronics called things like Kenworth, but didn't do instruments. What became K-Mart and Woolco started as Kresge's and Woolworth 5 and dimes that didn't do musical instruments either. Fender and Gibson were selling through independent music stores and what became the big chains like Tom Lee and Long and McQuade.
Canada developed it's own makers like Larrivee, Simon & Patrick, Garnet, Traynor and Yorkville, but none are a substitute for Danelectro.