for the permanent location of the Graduate School and the elimination of the eating clubs, which he proposed replacing with quadrangles, a precursor to the residential college system. Wilson also continued to keep Princeton closed off from accepting Black students. When an aspiring Black student wrote a letter to Wilson, he got his secretary to reply telling him to attend a university where he would be more welcome. John Grier Hibben became president in 1912 and would remain in the post for two decades. On October 2, 1913, the Princeton University Graduate College was dedicated. When the United States entered World War I in 1917, Hibben allocated all available University resources to the government. As a result, military training schools opened on campus and laboratories and other facilities were used for research and operational programs. Overall, more than 6,000 students served in the armed forces, with 151 dying during the war. After the war, enrollment spiked and the trustees established the system of selective admission in 1922. From the 1920s to the 1930s, the student body featured many students from preparatory schools, zero Black students, and dwindling Jewish enrollment because of quotas. Aside from managing Princeton during WWI, Hibben introduced the senior thesis in 1923 as a part of The New Plan of Study. He also brought about great expansion to the university, with the creation of the School of Architecture in 1919, the School of Engineering in 1921, and the School of Public and International Affairs in 1930. By the end of his presidency, the endowment had increased by 374 percent, the total area of the campus doubled, the faculty experienced impressive growth, and the enrollment doubled. Hibben's successor, Harold Willis Dodds would lead the university through the Great Depression, World War II, and the Korean Conflict. With the Great Depression, many students were forced to withdraw due to financial reasons. At the same time, Princeton's reputation in physics and mathematics surged as many European scientists left for the United States due to uneasy tension caused by Nazi Germany. In 1930, the Institute for Advanced Study was founded to provide a space for the influx of scientists, such as Albert Einstein. Many Princeton scientists would work on the Manhattan Project during the war, including the entire physics department. During World War II, Princeton offered an accelerated program for students to graduate early before entering the armed forces. Student enrollment