a citizenship myth

     One myth about American citizenship that hasn't died is the notion of dual citizenship. No American has dual citizenship, according to the government and laws of the United States. When an immigrant becomes a United States citizen, he or she renounces citizenship in any other country. When an American becomes a citizen of any other country, he or she is presumed to have renounced American citizenship.  This one must be in the "we keep repeating it, so it must be true" file.  I would like to see that file made public, and its myths turned over to the "wiki" for correction.