Jeffrey D. Sachs is University Professor at Columbia University and serves as Quetelet Professor of Sustainable Development and professor of health policy and management at Columbia University. He is a New York Times best-selling author, and his Columbia University Press books include The Age of Sustainable Development (2015) and Building the New American Economy: Smart, Fair, and Sustainable (2017).

The American Century began in 1941 and ended on January 20, 2017. While the United States remains a military giant and is still an economic powerhouse, it no longer dominates the world economy or geopolitics as it once did. The current turn toward nationalism and “America first” isolationism in foreign policy will not make America great. Instead, it represents the abdication of our responsibilities in the face of severe environmental threats, political upheaval, mass migration, and other global challenges.