In NYC, the first stop for Jewish immigrants was the Lower East Side or Alphabet City. By the influx of Jews in the 1880s, the previous generation had started assimilating and you'd see them all over, especially the Upper West Side, which was the "historic" home for Sepharim (from the early "New Amsterdam" days) and the more-assimilated Jews from Western Europe. That transition from Lower East Side to Upper West Side was kind of the "American immigrant" story in a nutshell: Arrive as a greenhorn peddler, make your way, learn the customs, send your kids to school, become a success, assimilate, move away from the other immigrants, become an official American.