Can you not renounce your original citizenship and hide this from the government(s)?
In the case of the U.S., there is no need to hide additional citizenships, acquired involuntarily or voluntarily. The U.S., due to its history with slavery and its response with the 14th Amendment, has made it almost impossible for the U.S. to revoke somebody's properly acquired citizenship , no matter what you said or did or promised to a foreign government like Japan. Even if you did something so bad that you'd be a candidate for denaturalization , the modern U.S. government would simply throw you in jail (or execute you via the death penalty), rather than revoke your U.S. citizenship. Even so, a U.S. State Department page still warns that: ... U.S. citizens are subject to loss of citizenship if they perform certain specified acts voluntarily and with the intention to relinquish U.S. citizenship. However, what the U.S. State Department says on its site and what the U.S. Supreme Court has ruled (overriding the original stricter intent of the Immigration and Nationalit...