 His administration engaged new groups that had been kept out of the political system, gave New York its modern infrastructure, and raised expectations of new levels of urban possibility.Immigrant families continued establishing themselves, and more started moving into the neighborhoods outside of Manhattan; in a sign of municipal maturation, the 1920 census showed Brooklyn for the first time overtaking Manhattan as the most populous borough.But the great period of European immigration which had only just passed its peak was halted abruptly by the Immigration Act of 1924 which severely limited further immigrants from Southern and Eastern Europe.