Your facts-based argument is that people in Detroit would move to Canada if the immigration policy was relaxed? I see no facts at all around that assertion, which is the one I was calling simplistic.

> What does bordering have to do with Canada's regressive immigration policies that prevent low skilled, low education persons from immigrating into the country?

You said (paraphrasing):

>> Why are there no hispanic people in Canada, relative to the US

I said:

>> Because it's not bordered by Mexico

(And, by the way, Mexico is the #1 source of immigrants for the US).

> The US isn't bordered by Pakistan, India, Vietnam, China, Philippines, or El Salvador. Six of the top 10 immigration countries for the US.

Out of those 6 countries, one would qualify as contributing to the Hispanic or Black population in the US (the groups we were discussing).

Out of the top 10, none are from countries in Africa or the Caribbean (which we might also consider to be a "black" population).

So we can agree then, that the US's diversity w.r.t. black people has nothing to do with immigration?

> See: population growth over time in Nevada, Arizona, California, Florida, Texas, etc. Silicon Valley exists precisely because the US works that way.

Those are also states that have heavy immigrant populations because they're attractive for skilled workers or close to natural entry points. You'll have to cite a source stating that the growth in those populations is from internal movement.

The US as a whole is fairly close to replacement rate births, so we would actually expect populations to remain stable.