Even immediatedly after WWII, Yidden even in New York did NOT dress outwardly overtly Jewish. The Rebbe often wore a Shtreimel on days other than Shabbos. Believe me, as soon as he stepped off the boat, World Jewry knew his exact address. And while, surely, there were tzadikim who kept Shabbos in America long before, even they dared not walk the streets of America (including NY) with a yarmulka publicly visible, a Jewish hat, tzitzis out, etc.
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