> So what?

The point is you have a view and the after that fact have found an argument (not a particularly compelling one).

Unfortunately (for you) the burden of proof at the very minimum (or maybe more properly on everyone in this domain) is on you as immigration from non-democracies is as older than the United States itself, you are the one advocating for a departure from this historical fact.

The countries you list are actually not as similar as you might like to believe, in so far as they are similar not for the reasons you believe, but it might be your own inability to see the differences here, nor do they prove your proposition that somehow there is some determinism by deep roots (or lack thereof) of people.