DBWI: Annexations became taboo following WW2?

Looking back on the recent Second Russo-Ukrainian War and Putin's annexation of the Donbass, here's a fun WI.

What would have happened if the Great Powers decided that territorial borders should remain relatively fixed, with only independence/unification/minor readjustments allowed, at the end of WW2? So victory in war would no longer be a justification for territorial annexations.

I suppose Israel wouldn't have been allowed to annex the Golan Heights, for example.
 
Post WW2, how so?
Well, African wars would probably be more about acquiring influence in other African countries than about "unifying (insert dominant ethnic group in the aggressor country here)" or resolving border disputes from the time of colonialism. Ditto for the Middle East.
 
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Pangur

Donor
Well, African wars would probably be more about acquiring influence in other African countries than about "unifying (insert dominant ethnic group here)" or resolving border disputes. Ditto for the Middle East.
Ah right, I was trying to think of a case where one nation annexed another in Africa post WW2
 
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