Suppose that a family enters an area of land when they have no legal right to do so. They stay and live there for years using the property for lawful purposes (apart from their continuing trespass). At some point, the actual owner or authority returns and tries to kick them out.
Am I describing a case of adverse possession (where the squatter may well get title) or a case of illegal immigration (where deportation is the result)? This comparison raises some interesting questions, though the idea is not original to me. See Timothy J. Lukas & Minh T Hoang, “Open and Notorious: Adverse Possession and Immigration Reform,” 27 Wash. U. J. L. Pol’y 123 (2008); Monica Gomez, “Immigration by Adverse Possession: Common Law Amnesty For Long-Residing Illegal Immigrants in the United States,” 22 Geo. Immigr. L. J. 105 (2007).