Improving the quality of a country’s governance was significantly more important than improving its economy. In another large study commissioned by the World Bank, James Fearon considered the economic question. When a rich country had a worse government than experts would expect given its prosperity, he found that it faced “a significantly greater risk of civil war outbreak in subsequent years.” So a wealthy country like the United States is more likely to experience a civil war when its government becomes less effective and more corrupt, even if its per-capita income doesn’t change.