I think one of the biggest similarities, as this discussion shows, is how hard it is to pinpoint populist campaigns into the political spectrum. Nazis as right wing was originally because nationalist parties sat on the right side of the Reichstag. But only with the national ideology the Nazis couldn't have won. The gained a lot of socialist votes by integrating socialist topics. Does that make it a left party? Hard to say, but at the same time i have a really hard time to find out what really is the motivation behind the new US president. He said so many things to different crowds that its hard for me to get a grasp of the man, but thats the problem with populism.
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det:
Very interesting article, and its really hard to point to where exactly we stand, and i'm even inclined to say they weren't right wing, but - and this is the important part - the aren't left wing. Reason for me pointing this out: Nazis are extreme left is often used in my country to create a connection between socialist and Nazis (which is to a small extent true for austria (who took in a lot of nazis after the war) but its just stupid if its used by the right wing party in austria (who was founded exclusively by Nazi members))
The conclusion of your article probably describe my own feelings on the matter best:
"He was socially so much right, the rest doesn't matter: He was an extreme right"