The League of Nations was destined to fail from the start. The point was to have Germany, USA, and Russia as well as a few other nations all in one pact. USA was practicing isolationism so they did not join, Germany started the war, so they too did not join, and Russia was a communist state so they were also excluded. The three biggest countries in the world were not a part of the pact, and as a result The League of Nations was never meant to be.
What if just one of the three major countries were convinced to join?
What if just one of the three major countries were convinced to join?