We seem to have an answer to why people suspect India, as as...

Indian immigration seems to be the most cognitively selective immigration known in the sense that the delta between the country and the immigrants is the largest we know of.
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Linked at the end.
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British Indians are not particularly brilliant like American Indians. They're not dumb, but they're not as often top-scorers:
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Britain's Chinese being less capable than America's Chinese is also explicable via the Commonwealth. The biggest wave of Chinese immigration to Britain happened in the 1950s-60s from HK and it was filled with male farm workers.
For example: the story of how the Mirpuri escaping a flood resettled en masse in Britain, brought high rates of endogamy from their particularly cousin-loving area -> explaining Brit. Pakistani weirdness today
And Lazear's study: journals.uchicago.edu/doi/abs/10.108…
Some of the evidence comes from setting up bigger barriers with everyone but Canada. That made the composition of immigrants who got through more elite:
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Wall goes up, crossing becomes harder, so the ones who make it to the U.S. are more likely to be strivers and are thus more positively selected.
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But anyway, check out the study: sciencedirect.com/science/articl…



