Isolationism and Rand Paul

In America, isolationism grew up in the years between the wars, 1919 to 1939.  People who were horrified by the casualties of WWI or dissatisfied with the outcome of the Versailles Treaty began to preach that America should  stay at home, build up business, and let the rest of the world sink or swim. A luxury permitted to a continental power with abundant domestic natural resources. Isolationism prevented the US from joining the League of Nations, allowed Hitler to do what he liked, and prevented the US from entering WWII until the Pearl Harbor attack
   WWII discredited isolationism, and the Anglosphere, led by America, set up the post war world and has run it ever since.  It's been a fairly decent world, far more decent than a world run by the Communists or Islam would be.  We have insisted upon the sanctity of international borders, free trade, freedom of the seas, liberating colonies, reasonable stability in international currency exchange, self determination, i.e. no messing around in the internal politics of other states, and human rights.  The Pax Americana has been successful, it outlasted the Soviets, avoided WWIII, and has not been unduly expensive for us to maintain.  The bulk of the world has been happy with it.  They trust the Americans to uphold international order and not take them over. 
   Counterexamples, Putin in Ukraine, ISIS, and others serve as horrible examples of what could happen without the Americans. 
   And now we have Rand Paul running for President and preaching a return to isolationism.  Let us hope the American voters have a better grasp of modern history than Mr. Paul has.