To travel to the USA you need some documents. You definitively need an electronically readable international passport and a visa or ESTA. To drive you'll need a driver's license.
An electronically readable international passport is mandatory for travelling to the USA. Your passport has to be valid for the entire stay. Also children and babies need a passport.
If you are willing to travel to the United States, you need to obtain a visa, unless you are eligible to apply for admission under the Visa Waiver Program.
To strengthen the security of travel to the United States under the Visa Waiver Program, requirements to travel visa-free have been enhanced. Nationals of Visa Waiver Program countries will still be eligible to travel without a visa but will have to obtain an approved travel authorization prior to their travel to the United States.
If you are planning to rent a car in the USA, we recommend to bring an international driver's license. This can be obtained at your city's services. It is not mandatory. you can rent a car with your national driver's license, but it is just easier for the rental company or the police if it is an international version, in English.