Modern Day Squatters And Adverse Possession

From Fox News: Squatters in a Texas town....

When they arrived, the squatter showed them a document claiming something called “adverse possession.”
“Adverse possession is a concept that's been around for a long time. It was created when Texas was a Republic to resolve land disputes," Shannon explains. "So for example, if one man’s land had a river as a boundary, and the river changed course over the years, who’s entitled to that land? The adverse possession allowed a new owner to claim the land, but only after openly possessing it and using it for years."