The US government is the oldest continuing operating federal system, in part because of its relatively high degree of stability and respect for the rule of law. But does that make the US system a model for other nation-states to emulate? “Federalism in the world” compares and contrasts the federal systems of six countries—Switzerland, Canada, Brazil, Australia, India, and Nigeria—to better recognize the strengths and weaknesses of the US system. The idiosyncratic elements of each nation’s federalism are a function of the social, economic, and political forces that contest politics; the nature of the ethnic, linguistic, political, and other cleavages; and decisions made by leaders in the past.