Why would there be any doubt? It's not like nations ceased to exist when United Earth was formed. They just became part of a greater whole.
I mean, the USA still exists, so why wouldn't Canada? It makes no sense.
Because Canada isn't really a country, it's a series of provinces and ethnic enclaves.
It's more like the Austro-Hungarian empire, in that it's a series of different ethnic groups. And when I say ethnic groups, I don't just mean racial.
White people are divided up by language English-French and there's a steep divide between Anglos who are immersed in a more international demographic and those who are not. immersed in international environment isn't a political thing either. My cousin is an ultra feminist and her entire crew of friends are super white folk who love hockey and canoeing the great Canadian wild etc. Her brother is pretty much the total opposite, the vast majority of his friends are indians/hindu/muslim/sikh. He doesn't like Hockey, doesn't have any connection to his family's heritage or traditions and the list goes on. I enjoy visiting him and hanging with his friends because I feel like I'm in Dubai.
The point is your background has nothing to do with the culture you live in. It's the social climate your immersed in. So it isn't obvious to someone looking at statistics at a distance. Roughly 7% of the country is south asia, but about 10-15% percent of the population is immersed in South Asian culture. About 6% are east asian, but then anoth 15-20% live in areas that are heavily similar to east asian lifestyles, with tower living being the norm, high preferences for high cost recreational activities like snowboarding, and a amount of money spent on education. Native Canadians are 5% of the population, but about 10% of the Country lives in areas that traditional immersed in native environments with a much much tighter connection to living on the land/farming etc. And finally about 1/3rd of the country lives in French land, not just french speakers but Anglos who live in a partially french environment.
It's very very difference from the united states where the biggest cultural divided is your voting habits, with immigrants assimilating to the cultural quite quickly.