Requirements for acceptance into the profession vary considerably from country to country and acceptance of a qualification in one country is not necessarily transferrable to another - there is no international qualification. Therefore, the best approach for you is to enquire directly in the country where you hope to study and be accepted for registration. There is the added complication in the USA that different states require their own criteria to be met regarding examinations and registration. In any case, ask directly in the place you intend/hope to study and work. Be aware that the American education system is quite different from those in Europe and this site is primarily used by Europeans and mostly by people in the United Kingdom, so it is unlikely you will find useful help here regarding medical studies in the USA.