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Try and make a timeline in which decolonization never happens. Bonus points if the world wars still happen and decolonization still doesn't occur. What would need to be changed for Europeans to keep their colonial empires? IMO Decolonization could have been averted had the colonizing countries given equal status to all people living under their empire. Though this is extremely unlikely, it ensures that the colonial empires survive quite easily as the reason why the colonial subjects rebelled IOTL was because of harsh rule which limited opportunities.