Colonialism is the establishment, exploitation, maintenance, acquisition, and expansion of colony in one territory by a political power from another territory. It is a set of unequal relationships between the colonial power and the colony and often between the colonists and the indigenous population.
While colonialism is a negative subject, what we might fail to see is that there are plenty of positive outcomes. While the method is brutal and pretty much wrong, it did open up countries, and bring them together; it provided crossovers beetween cultures and races. I believe we wouldnt have the "melting pot" that we do if it hadn’t been for colonialism.
I’m not saying it was a good thing or that I agree with it at all, but I think that SOME of the after effects are positive ones.