Citizens of the U.S. Visa Waiver Program countries are permitted to enter the U.S.A. for general business or tourist purposes for a maximum of 90 days without needing a visa.

To qualify for the Visa Waiver Program, travelers also need to comply with the following statements:

Length of stay in the U.S. must not exceed 90 days Must hold a ticket, e-ticket or proof of the return portion and/or next destination Fill out an I-94W form (also known as green I-94) to present to the agents upon arrival in U.S. territory (first point of entry) Must participate in the U.S.-VISIT program.

To obtain more information, please check the links below:
U.S. Department of Homeland Security
U.S. Department of State
TIA - Travel IndU.S.try Association of America