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alternatehistory.com
During the Great Depression, when it still looked like communism may indeed be a superior choice compared to market capitalism, thousands of Americans moved to the Soviet Union (can't find an exact figure; one article I found says that ~18 000 made the move in the 1930s). In time, these Americans assimilated (or were killed in the Purges, if you believe Tim Tzouliadis).
But what if a distinctive American cultural diaspora had survived in the U.S.S.R., akin to the way Confederados carried on their culture in Brazil? How would an American culture that separated from its "parent" culture back in the 1930s might have developed? What kind of traditions, sports, ethnic dishes or cultural traits might have lived on? What aspects of Soviet/Russian culture would this hypothetical American diaspora take on?