Invasion 101: Slaughter most of the original inhabitants and then claim the land as yours. That way, there would be few people you can return the land to if you are asked to do so. If not, the entire North and South America, Australia and NZ will need to be returned to their native populations.
Unfortunately, Han Chinese do not usually commit genocide as they are more focused on commercial enterprises.
That is spot on. In the Americas and Australiasia, we have seen how indigenous people got raped and murdered by the invading conquistadors/ europeans, and in a space of a few decades almost the entire indigenous population was wiped out, while european monarchs encouraged european migrations to these new found land to take advantage of its fertile land and natural resources. Indigenous women enslaved to their european male slave masters also doubled up as the white slave masters' mistresses, and thus producing what is today's mulatto and mestizo ethinic group, which form the majority of the people in the carribean, central and south american today.
The entire demographic of these so-called new world was transformed by the invading europeans in a very short period of time through systematic murder and enslavement of indigenous population and rape. Today, these places have turned from indigenous to white.