Although that's what they teach us in Canadian schools, in my experience it's the opposite. Ghettos and enclaves aren't really a thing in Canada like they are in the US.
There are some remarkably insular subcultures within the US like Latinos, Hasidic Jews, the Chinese (in some places), Amish and variants, Indians in certain towns like Edison, Black people in certain cities, to a degree that exists nowhere in Canada (and no, Brampton doesn't compare).
Subcultures in general are just not a thing in Canada, it's very much a monoculture.
I know you are making mostly an anecdotal claim, but if you compare Seattle and Vancouver, and more aptly, their suburbs Bellevue and Richmond, I think the American side is more assimilated simply because we don’t have the percentages of Chinese that the Vancouver area has.