A truly exceptional book. The focus is 29 democracies. The book explores a number of issues, including the impact of a state's party system on politics. One fascinating finding: presidential systems, like the United States, tend to be associated with greater instability and violence as compared to parliamentary systems. Why? Powell opines that even fringe parties can win seats in a parliament with proportional representation rules, whereas presidential systems with winner take all rules in legislative contests (as in the US) "freeze out" fringe groups and interests. Is that accurate? Readers would have to make up their minds. All in all, a lot of fine work while studying only 29 democracies.