The 1920s immigration restrictions in the US did not affect manufacturing wages.
The US immigration restrictions of the 1920s lowered the occupational standings of whites and incumbent immigrants.
US counties with more immigrants excluded by the quotas of the 1920s saw increased in-migration.
During the Great Black Migration of the US, black southerners moved to northern counties, filling roles left by excluded immigrants.
During the Great Black Migration, blacks who migrated to counties with more excluded immigrants experienced greater economic gains.
That is from a new piece by Bin Xie in the Journal of Comparative Economics. Via the excellent Kevin Lewis.
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