Aprenda sobre los formularios I-94 e I-94W de la "Visa Waiver Program" que registran las fechas de llegada y salida de personas que están de visita en EE. UU.| www.usa.gov
Generally, a citizen of a foreign country who wishes to enter the United States must first obtain a visa, either a nonimmigrant visa for a temporary stay, or an immigrant visa for permanent residence. Visitor visas are nonimmigrant visas for persons who want to enter the United States temporarily for business (visa category B-1), for tourism (visa category B-2), or for a combination of both purposes (B-1/B-2).| travel.state.gov