Yes, all those countries were destitute third world warzones full of famine, feudal rule and settler-colonial brutality, and now they're all independent industrial nations.

It's true that they had wars to achieve this, but what is the alternative? To just let your enemies kill you in some of the worst genocides?

Check out the collected works of Ho Chi Minh, and read about what the French settlers did to the natives, and why they rose up.