- Paul S. Boyer
1920 to 1945 was a period of transformation. In 1920, the United States was a provincial society on the margin of global affairs. By the end of World War II, America's international position was preeminent. ‘1920–1945: From conflict to global power’ considers the extent to which America changed during this short period in terms of domestic and international affairs. The 1920s exuded a glow of prosperity so the Great Depression hit the country hard. Few Americans imagined that at this point, they were on the verge of another war. The war had many ramifications for the country, social and economic. It was the shift in the global balance of power that had the most impact for the future.