The U.S. jumped into WWI. That’s Isolationism?
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Let them go where?
Last time we played the isolationism game, we got WWII. And Obama’s been pushing us in that direction, even further.
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What "isolation game" are do you mean? Wilson created the idea of the League of Nations. US citizens 100 years ago rightly still saw their nation as one of limited central government, neutral in European affairs, and protected by oceans. The ideas that the USA needed a strong Federal Government and also needed to run a world empire was (and is) an evil Progressive notion, The reasons for the rise of Hitler and WWII had many reasons - among them the punishing terms of Versaille, the rise of aggressive Bolshevism and the Soviet Empire, and world economic collapse - brought on by newly formed central-banks cheap money and bubble blowing of the 1920's.
I agree with the counterfactual history that if the USA had simply stayed out of WWI and not favored the UK, both sides would have run out of food, money and lives by the end of 1916, forcing a stalemate.