Without international coordination on lots of things, countries would be a lot more isolated in many ways, and probably more likely to "solve" problems in a belligerent manner instead of trying to cooperate globally on diplomacy, sanctions, etc. read more
The United Nations only replaced the League of Nations after war world two so it stands that some form of the League of nations would have continued to exist, ether introducing the strong military powers or would continue as a speaking ground for most of the worlds nations. read more