Very few “democracies”—a term that is more strained the more the structure of the political system structurally disenfranchises rather than represents views in the electorate—are as winner-take-all as the US, combining a strong Presidential system with FPTP voting, and basically none of any significance has as strong of a duopoly as the US.

Canada typically elects 5 parties, though the Greens, NDP, and Bloc are typically sub-50 in a 338 seat house.