[umanwizard]

> should we then say that all English-speaking Americans have more in common than whatever ethnic stock they came from in another country, whether Mexicans or Asians or whatever group?

I’d say it depends on the extent to which they have maintained a meaningfully separate culture within the US, but largely, yes. I think in most cases, a kid born in the US to Chinese parents has more in common with white American kids than they do with kids brought up in Shanghai.

Just my opinion; I don’t have any quantitative way to back this up.