In order to become a naturalized citizens of the united states, one must be able to demonstrate knowledge of u. s. civics, be able to show english language proficiency, and

Being a current permanent resident of 18 years or older and pledging allegiance to the united states are are also requirements of naturalization. 

-hope this helps

Protecting and assisting  u.s. citizens  living or traveling abroad; assisting u.s.  businesses  in the international marketplace; coordinating and providing support for international activities of other u.s. agencies (local, state, or federal government), official visits overseas and at home, and other diplomatic efforts.keeping the public informed about u.s. foreign policy and relations with other countries and providing feedback from the public to administration officials.providing  automobile registration  for non-diplomatic staff vehicles and the vehicles of diplomats of foreign countries having  diplomatic immunity  in the united states