After World War II, Penn began a capital spending program to overhaul its campus, especially student housing. A large number of students migrating to universities under the GI Bill, and the resultant increase in Penn's student population, highlighted that Penn had outgrown previous expansions, which ended during the Depression-era. Nonetheless, in addition to a significant student population from the Delaware Valley, Penn attracted international students and students from most of the 50 states as early as the 1960s. Referring to the developments of this time period, Penn Trustee Paul Miller remarked about Penn's undergraduate housing situation: "he bricks-and-mortar Capital Campaign of the Sixties...built the facilities that turned Penn from a commuter school to a residential one..." By 1961, 79% of male undergraduates and 57% of female undergraduates lived on campus.