Questions on the application of International driving licence crops up often, as does the answer from well intentioned expats stating that is not necessary to hold one when visiting the USA.
Note the information from the USA government website and printed below:
“Foreign Nationals Driving in the United States
People who drive in the U.S. must have a valid driver’s license. Some states require an International Driving Permit (IDP) from foreign nationals, in addition to a valid license from your own country. Contact the motor vehicle department of each state you will drive in for its requirements.
Short-Term Visitors
If you intend on getting an IDP, you must do so in advance of your travel:
The United States does not issue IDPs to foreign visitors. To get an IDP, contact the motor vehicle department of the country that issued your driver’s license.
If you want to rent a car, you may need both your license and an IDP. Find out the rental company’s policies and other requirements in advance”.
USA Gov Website