Roseville is an unincorporated community and neighborhood within the city of Newark in Essex County, New Jersey. It was farmland at the time of the American Civil War, but it was turned into US Army training and camping grounds during the war. It expanded greatly in the 1880s, and, at the turn of the century, it was predominantly Irish-American. In the 1950s and 1960s, the proportion of African-Americans increased, and, during the 1970s, Hispanic families from Puerto Rico, the Dominican Republic, and various Latin America mainland countries began arriving in the area.