Imperialism a la manifest destiny never existed?
Next you'll be demanding a 'Thank you' and a handshake from the plains indians, I suppose, for America's generosity in the non-tyrannical way in which they were slaughtered men, women, and children.
Um, lets see how many times we can show that a backward culture survives its encounter with a rising, powerful forward moving one. Seems like the number is ZERO.
Is it justified? No merely a fact of life.
Such population movements and changes are beyond the control of mortals it appears.
In addition, such quibbles are beside the point.