You will need either an Electronic System for Travel Authorisation (ESTA) visa waiver or a visa to enter or transit the USA as a visitor.
People Also Ask
How much does it cost? At the time of writing, an accepted ESTA application costs $21 (about £17) per person, and must be paid for by credit card. If your application is rejected, you'll be refunded most of this amount, less a processing charge.
In fact, there are well over 100 countries that Americans with passports can travel to, visa-free. With just a valid American passport, you can travel to most countries in Europe, Central and South America, and the Caribbean, as well as many other popular tourist destinations.
There is no minimum balance requirement for your bank account, however, based on the experience of others we recommend anywhere between $5,000 to $10,000 will be sufficient.