The term undocumented immigrant is another term bandied about by open borders zealots. The concept behind the use of this term is twofold:
However, illegal aliens are guilty of much more than missing a piece of paper. Indeed, most of them have an abundant collection of documents: false driver's licenses, tax ID numbers and social security cards.
Keep in mind that people who sneak across our borders and evade capture are not legally allowed to be in the United States, no matter what they are called.