born. The immigrant neighborhoods were located mostly south of the railroad line, near the factories and to the shore and included Eastern and Southern Europeans, Scandinavians and Irish. At this point, African Americans constituted 1.6 percent of Bridgeport's population. In later years, much of Bridgeport's labor force would come from other parts of the country and the Americas. By 1990, the African American percentage of the population had increased to 26.6 percent and residents of Hispanic origin constituted 26.5 percent of Bridgeport's population. By 1930 Bridgeport was a thriving industrial center with more than 500 factories and a booming immigrant population. World War II provided a further boost to the city's industries. Famous factories included Wheeler & Wilson, which produced sewing machines and exported them throughout the world, Remington UMC, Bridgeport Brass, General Electric Company, American Graphophone Company (Columbia Records), Warner Brothers Corset Company (Warnaco) and the Locomobile Company of America, builder of one of the premier automobiles in the early years of the century. The city was home to the Frisbie Pie Company from 1871 to 1958, and therefore it has been argued that Bridgeport is the birthplace of the frisbee. In another "first", Bridgeport had the first dental hygiene school in the country, opened in 1913 by Dr. Alfred Fones with a first class of 34 women. A growing city needed more housing and developers provided it, such as the Irish working-class neighborhood of Sterling Hill, the 1880s rental units now preserved as the Bassickville Historic District and the World War I emergency housing for workers that now constitutes the Black Rock Gardens Historic District. A rapidly expanding Bridgeport also needed more and modern schools, such as Maplewood School, built in 1893 and expanded several times thereafter, Central High School built in 1876 as Bridgeport High School, Warren Harding High School (1924) and Bassick High School (1929). The new immigrants wanted their own houses of worship, too, such as the Polish community's St. Michael's built in the East Side in 1907 and the Hungarian Jewish communities Achavath Achim Synagogue built in the West End in 1926. Bridgeport saw commercial development too, such as the formation of several banks and commercial establishments like D. M. Read's department store in its thriving downtown. In 1933, Lawrence Hoyt, who later went on to found Waldenbooks got his start in the book business when he opened up a small book rental business