The Philadelphia upper class engaged in fox hunting, race horse breeding, attending balls and lavishly entertaining in their townhouses or mansions. The elite also joined exclusive clubs such as the State in Schuylkill and the Philadelphia Union League. The upper class started with mansions in Old City, but through the 18th and 19th centuries upper class gradually moved west through Center City until the end of the 19th century when much of the upper class moved to large mansions along the Pennsylvania Main Line. The Philadelphia aristocracy lasted well into the 20th century but by the end of the century the old rich families were overwhelmed by the new rich. By the late 20th century, membership in the upper class was defined less by ancestry, and organizations such as the Union League began to accept limited numbers of Jews, Catholics, and African Americans.