To the people who already lived in NA before we settlers took over, we were the "illegals". The irony of xenophobic fear of immigrants will never cease to amuse me. (signed, a descendant of Zacharie Cloutier)
It seems the lesson is that if foreign people want to come and live here, they better come with an army and be prepared to fight. Another lesson is that if you let them in they will displace you and diminish your autonomy.
Of course the indigenous people fought - their home was being totally taken over, by force. That's not what's happening today.