I probably didn't word it quite correctly. It was the decolonization done by Europe after World Wars I and II. (In places like India and Africa).
They didn't have a whole lot of choice!
The people of those countries got tired of being treated like you-know-what.
Britain in particular used her Colonies to provide Military support during WWI and WWII.
They promised the Irish their independence if they fought in WWI (yeah, right.....like they had a choice!)
Don't know if you have heard of the Gurkhas of Nepal.
They became part of the British Army and, even though small in stature, had a reputation for being fierce, fearless fighters. They won many VCs and decorations, proving themselves in many battles, but their Officers were always British.
They were not treated very well, and the Brits were surprised when many of them chose to switch to the Indian Army after independence.