Dunno...where I live was bought from the people who were living here at the time by Penn...since he chose not to rely on his charter from the English Crown.
In fact attempts by Mexican illegals to claim territorial sovereignty within US borders--
a concept called "Aztlan"--is one aspect of the recent demonstrations that generated the most negative reactions in the US public...go figure. Damn racists, won't play along.
“I have proudly affirmed that the Mexican nation extends beyond the territory enclosed by its borders.” -- Mexican President Zedillo, 1997
All the more reason to make sure they leave, I'd say.
I assume Billy will be giving NZ back to the Maoris. But I'd also guess we won't go as quietly.