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In Canadian history, the two-party monopoly of the Liberals and Conservatives was broken by left-wing (and later right-wing) regional parties from the Prairie, like the Progressives, CCF, and Social Credit.
I had to wonder, what could make America develop similar regional parties? Thus, I present my challenge: have one or two stable third parties, ones who regularly win seats in Congress, become dominant in specific regions of the country, i.e. Populists who are dominant in western state governments.