Colin, you go back far enough, and EVERONE stole their present lands from some other earlier people.
It was the Spanish and Portuguese who took Indian empires by direct force. It was Eurasian and African diseases that killed of most of the North American indigenous peoples.
The English and French filled a sparsely populated vacuum.
The history of mankind is a history of exploration into unpopulated lands, the movement of people, and conquering of earlier peoples were the those lands had people. The Bantu people of Africa conquered most of the San people’s territory in Southern Africa, for example.
Even the ancient Philistines conquered their land from the Avim.
-PJ