What are the positive effect of imperialism to empires and colonies?

Many colonies were economically more developed than they likely would have been had they not bee colonized. An example of this is India, a country which likely wouldn't be in the economic position it is today if it weren't for advances made under British rule. India would likely be even less developed than it is today and would probably be split into several if not many smaller nations/kingdoms.

i think they would live in caves or natural tunnels

aa dikha du tujhe mera wala dance