An accidental American is a citizen of a country other than the United States who may also be considered a U.S. citizen under U.S. nationality law but is not aware of having U.S. status, or has only become aware of it recently during adulthood.
Trow, Steve; Bruce, Charles (2007-03-26). "U.S. Citizens Who Don't Know It" (PDF). Legal Times 30 (13). Retrieved 2014-11-03.