Primitive indigenous peoples always get swamped by more advanced civilizations. Sucks to be them.
How'd that work out for the Christians in Byzantium, the Zoroastrians in Persia, and the Hindus in the Indian sub-continent? I'm referring to the eras when primitive Islamic hordes invaded advanced civilizations, converted some, killed others and took all the women as their concubines and slaves?
Or, how about the most cultured western nations in both the USA and Europe being colonized right here, right now from far less technologically advanced countries?
] You see, it has nothing to do with such pejorative/judgmental terms as 'primitive', 'advanced', 'civilization', etc. Rather, it's all about the will to power: Who has it, who's utilizing it, who's advancing their particular agenda.
Nobody owns any territory - it's all up for grabs, constantly in contest. Invaders don't respect the borders, laws, customs and/or wishes of the current inhabitants. If you can't/won't defend what you occupy, it's not yours.