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The Nazis associated healthy race feeling with warmongering, mass murder, and general lunacy. This did us no good at all domestically.
Nowadays Jobbik plays a similar role. They give moderate nationalist movements a bad name.
The US was also in position, if it wanted to, to play a major role in the world without WW2. It could have done so after WW1 and didn't. The events set in motion by Hitler though forced us to take on the burden of global leadership, and it's a pain in the ass.
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