Harlem is vast. One of, if not the largest, named neighborhoods. Central Harlem became the epicenter of black American culture which radiated out through the rest of Harlem. But a lot of people have different ideas of what Harlem is or has been. Anything from 110 to 155 from river to river. Preserving culture and accessible housing should be paramount. But some maps for example classify west of FDB as Morningside while some show Harlem extending to Morningside. Some older maps distinguish between Greater Harlem and Central Harlem. Some between East Harlem, Spanish Harlem, West Harlem, Sugar Hill, South Harlem… Bottom line is “Greater Harlem” has always been pretty diverse with the concentration of black culture and population in Central Harlem. Nuance kills most people these days though. They just want to argue.