Whats the difference between legal and illegal aliens?
Short answer: a piece of paper. Illegal aliens are foreign nationals who have entered the U.S. without any legal status. The most common ways are by either crossing a land or sea border without being inspected by an immigration officer, or simply by violating the terms of a legal entry document. Legal aliens are entitled to enter and remain in the U.S. as long as they maintain the terms of their status. Legal aliens who have entered the U.S. with various types of non-immigrant visas can become illegal by not obeying the terms of that visa.
