Huh? Various ancient peoples led continent wide conquests. In the new world and the old.
I’m not saying modern nations are “better”, I’m saying human nature, the process of power, and the means of acquisition are uniform through time. Further, nearly every section of territory we are discussing was “conquered” multiple times.
Of course there were less people there hundreds of years ago, that doesn’t change displacement/ acquisition/genocide/ etc
So genocide is the key word. A lot of conquest did not involve the displacement or extermination of entire peoples until colonialism.
Conquering a place was largely “so you pay tax to me now” prior to colonialism, at which point it became more “so you are subhuman and need to be exterminated or bread of of existence”