https://en.wikipedia.org/wiki/Genetic_history_of_the_Indigenous_peoples_of_the_Americas
We know now, from two digs in the US, white sands and Oregon, that people have been here since 20-25k BC. The populations, genetics, have changed. This suggests multiple ‘invasions’ or near complete destruction of populations, especially males-Y chromosomes.
So if your going to call it Stolen, then figure out who it originally belonged to before the thefts began. The people that were here in 1500 AD, were just the latest invaders and thieves of the land.
It’s really a stupid statement, about ‘stolen land’, since people have been ‘stealing it’ for 25k years.