Testo originale - Inglese - The visa waiver program is a U.S. government...

The visa waiver program is a U.S. government program that enables citizens and nationals from the 38 Visa Waiver Countries to enter the United States for tourism or business purposes for up to 90 days without obtaining a visa. The advantage of entering the United States under the visa waiver program is that you can travel to the United States on short notice without obtaining a visa in advance.