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In any European country after WWII, a Far Right Party has to win a true majority(a coalition is allowed as long as said party is dominant) in the legislative body. If there is a separately elected President(like France), the President has to be of said party. They cannot install an actual dictatorship though, although something like OTL Hungary is allowed. The nation cannot be a former Eastern Bloc country(Germany is allowed of course), although southern Cyprus is allowed. Bonus points if the country is not Austria and/or the party comes to power before 1989.
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