This textbook is the second volume of "American Economic History" and introduces undergraduate and advanced undergraduate students to the economic foundations of America. It covers the period from World War I and the founding of the Federal Reserve to the aftermath of the 2008 financial crisis and explores major macroeconomic theories, policy shifts, and social transformations. Topics include the Great Depression, World War II, urban change, the Cold War, stagflation, and the rise of the service economy. Students will also examine the evolving role of women, the Southern economic resurgence, and the causes and consequences of financial crises. Drawing on the author’s lectures and previous works, the book provides an insightful foundation for understanding America’s modern economic evolution.