Adverse Possession and Eminent Domain are forms of Involuntary Alienation. What are the requirements for both of these methods to acquire land? Determine the requirements for Adverse Possession in Pennsylvania. What is "Tacking, as it applies to Adverse Possession?" Is the concept of Eminent Domain limited to just the federal government? Where in the U.S. Constitution does it state that the government has the right to take land by Eminent Domain