Well thats the point that I didn't mention / forgot in my other reply.
The reason isolationism was gone was due to WW2 and its aftermath <<-- key!
Because of the crumbling of the old European empires and nations, there was suddenly a huge power vacuum. Before the 20th century one could see numerous empires in contention.
Now suddenly after WW2 there was a power vacuum and two nations emerged that were powerful - the U.S. and the Soviet Union.
Because of its duties in the war, the U.S. realized it could NOT just sit out and not help those nations devastated by war.
The Soviets for their own reasons (mainly Stalin being the one here) decided to take their share.
Now don't get started on the starting of the cold war -there are literally thousands of books out there on who and what exactly started it and theres always a differnet explanation.
But the key IMo is the aftermath gave the U.S. little chance to go back to isolationism - they realized they couldn't.
But if you think about it, had there not been a Soviet Union (mainly had their leader Stalin not been a wacko IMO) things might be a lot different. Had they had a guy like say Gorbachev who was willing to have peaceful co-existence, hell even trade and what not, things would be quite differnet and isolationism might actually be appealing.
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