Citizenship of the United States
A person who is considered a citizen by more than one nation has "dual citizenship". It is possible for a United States citizen to have dual citizenship; this can be achieved in various ways, such as by birth in the United States to a parent who is a citizen of a foreign country (or in certain circumstances the foreign nationality may be transmitted even by a grandparent) by birth in another country to a parent(s) who is/are a United States citizen/s, or by having parents who are citizens of different countries. Anyone who becomes a naturalized U.S. citizen is required to renounce any prior "allegiance" to other countries during the naturalization ceremony; however, this renunciation of allegiance renunciation of citizenship to those countries.
Juan Mari Brás
In light of the Supreme Court's decision, on June 4, 1998, the U.S. State Department reversed its November 22, 1995 decision and declared that Mari Brás was still a US citizen. The U.S. State Department argued that as Mari Brás had continued living in a US territory, he was still a US citizen. According to the State Department, US Immigration and Naturalization law stipulates that anyone who wants to give up their US citizenship must live in another country.