En el caso de Arizona ahi estan las reglas, me imagino que cada estado es distinto, tengo entendido que con tu permiso de 6 mcs te la dan por ese tiempo..
What is needed for a person from another country to drive in Arizona?
You may legally drive in Arizona using a valid driver license from another country. An International Driving License or Permit is not required, but is recommended since it can be printed in English, and can be used in conjunction with the driver license from the other country. If an International Driving License or Permit is used alone, it must be issued by a country other than the United States. Vehicle rental companies may have additional requirements.
However, Arizona law requires that you obtain an Arizona driver license (and vehicle registration) immediately if any one of the following applies. If you:
Work in Arizona (other than for seasonal agricultural work) -or-
Are registered to vote in Arizona -or-
Place children in school without paying the tuition rate of a nonresident -or-
Have a business that has an office in Arizona, and that bases and operates vehicles in this state -or-
Obtain a state license or pay school tuition fees at the same rate as an Arizona resident -or-
Have a business that operates vehicles to transport goods or passengers within Arizona -or-
Remain in Arizona for a total of 7 months or more during any calendar year, regardless of your permanent residence.
Out-of-state students enrolled with 7 or more semester hours are not considered Arizona residents, regardless of employment.
Active duty military personnel based in Arizona who qualify for exemption under the Service Members Civil Relief Act of 2003 are not considered Arizona residents.