Believe it or not the forerunner of the UN was the League of Nations a group highly touted by then US President Woodrow Wilson. The idea of a League of Nations was proposed after the end of WWI to prevent such wars in the future. The League was started but without the United States participation as the US Congress wisely decided not to become involved.
The League of Nations might have succeded but the reparations imposed on Germany after the first war were utterly preposterous. Germany in no way could pay the reparations in the first place, let alone rebuild their economy. Seems Mr Clemenceau and Mr Georges wanted to extract their pound of flesh, to which Pres. Wilson was highly opposed. Thus just a few years after WWI it took a wheelbarrow load of Marks to purchase a loaf of bread. Seems the Germans had to print more marks to pay their war debt thusly driving down the value of the Mark and generally the stage was set for WWII.
I like the Europeans a great deal.......wonderful people. Lots of friends from Europe by the way . But if history is any benchmark Europe has..........and always had problems politically that resulted in many long and devastating wars before the world wars occured. I guess the proximity of the borders of so many counties could encourage this.
An American Statesman once warned "Beware of Foreign entanglements!". As one recalls history we tried to not get involved in either world war........we were dragged in by default. LOL and we were draggged in by a few european countries that realised they couldn't win without the United States support.
The United States has taken care of itself just fine. And as an American Citizen I'm sure we can continue to do so. Europes horrible track record of Policing itself is a great reason for the US just to sit on the sidelines............observe. .........and if anything develops that could threaten our national security then get involved. Otherwise........lettem' do what they want. If the European Union is going to count on France, Germany, or even Russia to help .............hope ya got a good backup plan.