They call it Spanish Harlem or sometimes just El Barrio. But for over a century, East Harlem has been a melting pot of many ethnic groups, including Puerto Rican, Dominican, Cuban, and Mexican immigrants, as well as Italian, Jewish, and African American communities. Though gentrification is rapidly changing the face of this section of upper Manhattan, it is still full of sites that attest to its rich cultural heritage. Now East Harlem native...