 However, several neighborhoods in eastern North Philadelphia, especially Fairhill, have some of the highest concentrations of Puerto Ricans in the United States, Fairhill having the highest when being compared to other big city neighborhoods.Between the 1950s and the 1980s, large numbers of Puerto Ricans migrated to New York, especially to Brooklyn, The Bronx and the Spanish Harlem and Loisaida neighborhoods of Manhattan.Labor recruitment was the basis of this particular community.