Because the comprehensive ranking of American universities is not only based on the ranking of academic majors, of course, the academic nature is certainly more important among many factors, but also depends on its source of funds, whether the school is rich, whether the funds are strong, and whether alumni donate, which is also the reason why public universities are not ranked in the front, as well as the quality of students, the graduation rate of students, the size and environment of the school and so on.