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chaosmage comments on Open Thread, May 19 - 25, 2014 - Less Wrong Discussion
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I'm not sure how much it influenced the overall picture, but there was quite a brain drain to the US before and during WWII (mostly Jewish refugees) as well as after (Wernher von Braun and the like). Migrating away from the Nazi and Stalinist spheres of influence demonstrates intelligence, and the ability to enter the US despite the complex “national origins quota system” that went into effect in 1929 demonstrates persistence, affluence and/or marketable skills, so I estimate these immigrants gave a significant boost to the US economy.
Also: salt iodization in 1924. Possibly also widespread flour enrichment in the early 1940s due to both Army incentivization and the need for alternate nutrient sources during rationing.