The problem wasn’t that the idea was bad, but that there wasn’t an international order around to enforce norms.
World War I had several succession wars as empires fell apart and maps were being redrawn. Even with the end of those wars, there wasn’t anyone willing to step in if a nation violated these norms. France backed down after invading Germany for reparations coal in the 20’s, but Japan invaded China and wasn’t going to be stopped by a toothless committee.
In contrast, the UN became important in the Cold War world order as it gave a place for the two great powers to talk and try to gain international acceptance for their actions. There was also a vested interest by nations to enforce international norms; you generally needed a veto by one of the top 5 in the Security Council if you were going to break something. Great Power conflicts still happened, but there was a greater chance that a smaller war would be intervened in.
The problem wasn’t that the idea was bad, but that there wasn’t an international order around to enforce norms.
World War I had several succession wars as empires fell apart and maps were being redrawn. Even with the end of those wars, there wasn’t anyone willing to step in if a nation violated these norms. France backed down after invading Germany for reparations coal in the 20’s, but Japan invaded China and wasn’t going to be stopped by a toothless committee.
In contrast, the UN became important in the Cold War world order as it gave a place for the two great powers to talk and try to gain international acceptance for their actions. There was also a vested interest by nations to enforce international norms; you generally needed a veto by one of the top 5 in the Security Council if you were going to break something. Great Power conflicts still happened, but there was a greater chance that a smaller war would be intervened in.