The University of Southern California (USC, SC, or Southern Cal[a]) is a private research university in Los Angeles, California, United States. Founded in 1880 by Robert M. Widney, it is the oldest private research university in California and has an enrollment of more than 47,000 students. The university is composed of a liberal arts school, the Dornsife College of Letters, Arts and Sciences, and 22 undergraduate, graduate, and professional schools, enrolling roughly 21,000 undergraduate and 28,500 post-graduate students from all fifty U.S. states and more than 115 countries. It is a member of the Association of American Universities, which it joined in 1969. USC sponsors a variety of intercollegiate sports and competes in the National Collegiate Athletic Association (NCAA) and the Big Ten Conference.