If you are travelling under the Visa Waiver Program in order to transit the U.S. or to stay for up to 90 days as a tourist or for a business purpose that does not normally require a visa, you must pre-register with ESTA in advance of your planned travel date. If you are travelling with a visa for tourism or work- or study-related purposes, you are not required to register with ESTA. American citizens are not required to register with ESTA.
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