Catherine the Great is a big old antisemite: She judges the Jews of the PLC to be unassimilable and unacceptable for the Russian states. Have the Russian government expel Jews from each piece of Poland it partitions as it takes over. That forces major displacement west and south. The whole Jewish population concentration in what became the Jewish "Pale of Settlement" is displaced southward and westward in Europe. The westward displacement would be to places that had earlier established migrant flows to the USA than the Russian empire did.
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