In reply to Wide_Mouth_Frog:
Colonialism i would say has done nothing good, despite how nice a life it has given us, including me!
Religion, I would say a good job was done by Europe of eradicating traditional belief across Africa. in favour of their preferred Christian ones. and yes I know Christianity was there long before colonialism in the horn of africa.
Drawing borders across the land causing future conflict and devision. Gassing the unruly somalis with mustard gas, for daring to resist. The Belgian's did a an amazing job in Rwanda at dividing a country and priming it for future conflict, or was it all the fault of the africans for not getting on with each other despite the Belgians going to all the trouble of measuring and classifying people for preferential treatment and South africa, Such a fair land!
The introduction of UK fixed land agricultural practices across africa on soil that cannot sustain it and never will.
Slave trade to the americas,( Nice cross continental travel system.)
Railways throughout india and other colonies were not built for public transport they were to extract wealth from the country and did it well. The building of which deforested large parts of the land which still is deforested, The Empire managed the removal of it not preservation. In general raw good taken out processed and sold back to the country, a good method of wealth extraction.
The drawing up of and eventual partition of india. one of the most rapid and brutal genocides of modern history with a couple of million people killed and 15 million displaced in about 6 months.
I dont think the eradication of traditional Languages and replacing it with english as something amazing. Even in india, they could speak each others language, there not dim. They seem to have done ok on the language and mathematics.
A time we were scratching in the mud still creating lords and robbing our own people. But once all was taken from the peasants in england we needed some more to rob blind. !
If Britain and the the rest of Europe had left the rest of the world be to do their own thing. im fairly sure it could have been a better place.