Keep in mind the resurgent antisemitism post WW2 in several Eastern Bloc countries was over a decade off at this point and the idea of Jewish nationalism had greatly diminished. For various reasons it came back and caused a huge reaction ( ie the rootless cosmopolitan campaign) and split in communist Jews. So end of the 20s they are riding high and integration and an embracing of Yiddish culture was a very clear reality for most people. The JAO had significant Canadian Jews come, and the USSR in general attracted a lot of the diaspora in this time because it was actively fighting against antisemitism.
Keep in mind the resurgent antisemitism post WW2 in several Eastern Bloc countries was over a decade off at this point and the idea of Jewish nationalism had greatly diminished. For various reasons it came back and caused a huge reaction ( ie the rootless cosmopolitan campaign) and split in communist Jews. So end of the 20s they are riding high and integration and an embracing of Yiddish culture was a very clear reality for most people. The JAO had significant Canadian Jews come, and the USSR in general attracted a lot of the diaspora in this time because it was actively fighting against antisemitism.