The United States has a longstanding tradition of welcoming foreign students and scholars, to other Visa categories, thereby facilitating the temporary stay of individuals seeking education or cultural exchanges on American soil. Also, the ESTA (visa waiver program) or B-1/B-2 visa allows foreign nationals to be admitted into the U.S. for either tourism or to conduct business on a limited basis. Currently, the U.S. allows citizens of 38 countries to enter the country without a visa through the Visa Waiver Program. The B- 1/B-2 visa allows individuals foreseeing long leisure stay in the U.S., or intending to do business in the U.S., to remain for a period of 6 months.
The U.S. is also among the countries willing to harbor individuals suffering persecution in their home countries, through the Asylum process.