The world is entering an age of disarray, argues Richard Haass, president of the Council on Foreign Relations. Globalization, climate change, and new technologies are challenging nation-states and eroding the foundations of global order. As power is diffused, and non-state entities grow in influence, the ability of governments to protect and govern their populations is being severely tested. For America this age of uncertainty has multiplied the complexities and dangers of global leadership at a time when rival powers have emerged to challenge the liberal international order. How did the world arrive in this period of volatility, and what might come next? And what should the United States do—and avoid doing—as a result?