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I'm currently working on a timeline, and beginning to wrap up the Great War. My plans include the rise of an ideology during the interwar. Another timeline, which shared some similarities, had Syndicalism as a "replacer" of communism as a world ideology.
What other ideologies could have gained much popularity, but for some reason never got to practice?
One ideology I found was very interesting - integralism (or integral nationalism, wikipedia has two articles on the same thing). France, Spain, Portugal and Brazil all had integralist parties. Integralism is sort of para-fascism. In 1937 the integralists tried to coup Brazil, but failed.

If not integralism, what other cool ideology could have made its rise during the interwar and cause alliances (Integralist League was one in my plans)?
The actual rise to power can be pretty much anything - a coup in a nation, a minor conflict (not a worldwide, though) or something else.
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