The US in particular has always been made up of immigrants. I don't know how it works for canada. But for the US, that's always been the case. We're a country by immigrants, for immigrants. An American identity is not one of skin color or race. To suggest otherwise is not just a ahistorical, it's anti-American.

There is no mind virus. People wish to rewrite history to fuel their own delusions. They don't require enforcement around immigration, they require medication and perhaps a history lesson or two.