U.S. citizens don’t need the federal government’s permission to enter and exit the United States. They can’t be forcibly removed from the United States, and they can’t be convicted of entering the United States without the federal government’s permission. Put simply, immigration law’s controls on movement are off-limits to U.S. citizens. But what happens when someone doesn’t know they are a U.S. citizen? The short answer is that things get complicated. For the longer answer, let’s turn to the ex...