International students from outside the United States apply to American universities. Because of different nationalities, the corresponding visa policies in the United States are different.

Compared with applicants from all other countries, American college students apply for Canada and Mexico, two neighboring countries in the north and south, and the visa requirements in federal policy are much looser; Applicants from English-speaking countries have relatively loose language and academic qualifications; Applicants from relatively developed countries in Europe and Asia are relatively relaxed in terms of economic ability. Since the September110 incident in 2006, the United States has adjusted its homeland security policy and visa policy for specific regions and countries, which has affected students from such countries and regions to apply for American university visas.