In the 1880s, Omaha was said to be the fastest-growing city in the United States. After Irish-born James E. Boyd founded the first packing operation in Omaha in the 1870s, thousands of immigrants from central and southern Europe came to Omaha to work in the Union Stockyards and slaughterhouses of South Omaha. They created Omaha's original ethnic neighborhoods, with names such as Sheelytown, Greek Town, Little Italy, Little Bohemia and Little Poland. Other neighborhoods founded during this period included Bemis Park, Country Club, Dog Hollow and Field Club. The Near North Side also developed greatly during this period, with high concentrations of Jews and Germans, and the first groups of African Americans.