What really diminished since WWII is real ethnical cleansing. And I mean by the definition of "forced removal of ethnic, racial, and religious groups from a given area". What China did was move in their people, and what Israel did is curve out the areas with low existing population and called them their own.
This, together with the democratic nature of the western world has led to a place where annexation of an area becomes infeasible for a place with a large opposing population (which is why Israel is not officially annexing the west bank).
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What really diminished since WWII is real ethnical cleansing. And I mean by the definition of "forced removal of ethnic, racial, and religious groups from a given area". What China did was move in their people, and what Israel did is curve out the areas with low existing population and called them their own.
This, together with the democratic nature of the western world has led to a place where annexation of an area becomes infeasible for a place with a large opposing population (which is why Israel is not officially annexing the west bank).