In Michigan, property lines may be adjusted through various means, one of the most common is adverse possession. Which in essence involves one party actively working to take land from another, usually as neighbors. Often times this is done through real hostility and aggressive behavior. And that ends up deterring a more reasonable and less confrontational neighbor from telling their neighbor they believe their neighbor is trespassing and to stop, solidifying the adverse possession attempt after the statute of limitations have run.
Adverse possession is real, happens every day, and is the legally binding end result of a boundary dispute ignored by one party. Adverse possession can have serious consequences with the mortgage, taxes, and other ordinances, if you suspect your neighbor is attempting an adverse possession or you have a boundary line dispute contact an attorney immediately.