stop whitewashing it

yes, diseases killed the majority, but the diseases didn't come out of nowhere, they came from the European occupiers. and inter-tribal warfare killed plenty. but we're talking about theft of "available" land: the Europeans took the land from the remaining inhabitants, killing those who resisted, and deceiving those who submitted through treaties which they repeatedly broke, leaving the natives, by design, with the worst, most infertile land in the country

don't try to gloss it over and hand-wave it away -- yes, the natives were greatly diminished through the causes you mentioned, I never said the European occupiers killed them all, but it was genocide to finish them off and take all the land from anyone who resisted, effectively destroying their civilization

and stop calling them "settlers", they did not "settle" the land, they took it by force and deception