Let's understand this :
Canada could be a constitutional autocracy. The Queen, pictured by the governor, is that the head of state and also the Prime Minister is that the head of state. The U.S. could be a republic. the top of state and head of the govt. ar a similar person: the President. The Politics of Mexico surface in an exceedingly framework of a federal presidential representative democratic republic whose government relies on a law-makers system, whereby the President of Mexico is each head of state and head of state, and of a multi-party system. All three sets of government run in a democratic way, held elections and the representative is chosen by the people.
hope it helps!