“countries today means continents”
The Halacha should still be the same, as the Ch”S allows even countries that are under one Malchus,/Empire e.g. Galicia part of Poland, Hungary and Austria were all under the Austrian empire, (even next to each other) as long as it is considered a separate State AND Community is fine.
Canada perhaps might be an issue in some cases as being one community/Kehila ? I am not sure, but technically, CA should be considered as another country, I don’t see why not.