“we are mostly talking about Chinese heritage here, with a smattering of Korean heritage, “
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There are MANY Koreans in the Boston area,especially Newton-——and the Korean Consulate is located there.
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Harvard was the same way to Jews until the late 60’s or 70’s.
I think the attitude is that Harvard confers so much governoring power on their graduates that Harvard would prefer people from families that have been in the USA a couple of generations so they knew something about the people and country they governed.