When moving to the US what's the procedure to get a Registered Nurse certification for someone who's been working as a nurse in one of the Eastern European countries?
@juergend shared already in the comments a very useful link :
Each state in the U.S. is responsible for the licensure of nurses within that state. Variations exist among the states. State specific licensure information is available on board of nursing websites.
To ensure public protection, all boards of nursing require a candidate for licensure to pass an examination that measures the competencies needed to perform safely and effectively.