After World War II, farsighted European leaders sought to overcome centuries of hatred and warfare by striving step-by-step toward economic and political integration. Today an ongoing economic crisis in Greece poses a grave threat to that vision, bearing major lessons for the future of global economic cooperation. Europe’s postwar drive toward unity began with the removal of tariff barriers and proceeded with harmonizing regulations and making it easier for people to move across the region. The European Union (EU), a quasi-political confederation that allowed for the free movement of goods, capital, services, and people, was launched in 1992.[...]