The Bronx buildings.<ref>For an example of this argument, as well as of several other theses mentioned here, see "When the Bronx was burning" "City-data" forum (blog), 2007, where rubygreta writes: The Bronx The Bronx is the northernmost of the five boroughs of New York City, in the U.S. state of New York. It is south of Westchester County; northeast and east of Manhattan, across the Harlem River; and north of Queens, across the East River. Since 1914, the borough has had the same boundaries as Bronx County, the third-most densely populated county in the United States. The Bronx has a land area
Manhattan of Greater New York", Manhattan and the Bronx, though still one county, were established as two separate boroughs. On January 1, 1914, the New York State Legislature created Bronx County, and New York County was reduced to its present boundaries. The construction of the New York City Subway, which opened in 1904, helped bind the new city together, as did additional bridges to Brooklyn. In the 1920s Manhattan experienced large arrivals of African-Americans as part of the Great Migration from the southern United States, and the Harlem Renaissance, part of a larger boom time in the Prohibition era that included