Immigration to USA, Work Permits, and the Student Visa for UK
A citizen of a foreign country, wishing to enter the U.S., generally must first obtain a visa, either a nonimmigrant visa for temporary stay, or an immigrant visa for permanent residence. The type of visa you must have is defined by immigration law, and relates to the purpose of your travel.
Millions of foreign visitors travel to the U.S. each year. Others come to live here permanently. International visitors and immigrants add greatly to see nation's cultural, education and economic life.