So tell me where in the world there hasn't been "colonialization". It is the story of humankind that we battle with other groups, take over other countries/ areas and subjugate the losers. 

Even the North American natives did this through frequent wars with each other, taking slaves and even wiping out entire competing groups. Were they the original colonialists in North America? But I guess the theme these days at universities that only white colonialists are bad. So much for universities promoting free, independent thought.