Unlawful acts, performed long enough and with sufficient vigor, are never enough to amend the law. To hold otherwise would be to elevate the most brazen and longstanding injustices over the law, both rewarding wrong and failing those in the right. I disagree with this reasoning. As a counterexample I point you to squatters rights. If I live on your land long and openly enough, my unlawful act will confer ownership of…
But it does not work that way
Adverse Possession requires that the use be "open and notorious" and uncontested. [1]
The potential possessor must be using it in a way that is obvious (i.e., not sneaky), and not objected to by the owner.
Sure, the uses of the native lands have been open and notorious, but they have been continuously and vigorously contested.
This time, the owners finally won their contesting of the use of their land.
[1] https://www.nolo.com/legal-encyclopedia/what-open-notorious-...