> Similarly here in Canada our immigration levels per capita which are very high - maybe too high - are still at a rate similar to that of most of the late 19th century

Per capita is often a really dishonest framing

Especially compared to dates 100+ years ago, when we probably didn't have super accurate census numbers. Especially since Canadian census at the time probably didn't even really include Native Americans.

It's also very different to be welcoming large amounts of immigrants of very similar cultures, versus large amounts of immigrants with very different cultures

In my lifetime Canada is going to see enough of a demographic shift that people sharing the culture I grew up with are going to be the minority. I've already seen that many neighborhoods in Calgary do not really participate in Halloween anymore, for instance. Every parent in my neighborhood says they take their kids elsewhere for Halloween to go door to door because our neighborhood doesn't have many houses that participate

Is that a big problem? No probably not, but it kinda sucks to see