We live in an age of unprecedented, irreversible decline—or so we’re often told. Jonathan Tepperman’s The Fix: How Countries Use Crises to Solve the World’s Worst Problems presents a very different picture. It identifies ten pervasive and seemingly impossible challenges—including immigration reform, economic stagnation, political gridlock, corruption, and Islamist extremism—and shows that, contrary to the general consensus, each has a solution, and not merely a hypothetical one. By taking a