Citizenship issues encompass such things as citizenship at birth, citizenship acquired through parents, and naturalization.
With the single exception of qualification to become President, the law does not distinguish among categories of citizens. Indeed, there is only one "class" of United States citizen - irrespective of how citizenship is acquired.
Once acquired, United States citizenship remains effective unless formally renounced or revoked due to fraud. The only conclusive evidence of United States citizenship is a valid, unexpired United States passport. This evidence may not be challenged other than through a passport revocation hearing, initiated by the United States Department of State.
The United States neither prohibits nor encourages dual nationality. If a United States citizen takes an oath of allegiance to a foreign country, that individual will most likely lose his or her U.S. citizenship. Otherwise, a United States citizen may acquire or retain foreign citizenship. For more information, please click here.
Citizenship may be lost if any of six conditions pertain, irrespective of whether the individual acquired U.S. citizenship at birth, through naturalization, or as a derivative beneficiary. For more information concerning loss of citizenship, please click here.