By the end of the nineteenth century, the United States had become the world’s preeminent economic power. Yet for such a large and wealthy country, by 1890 the United States was in a curious position: it was an economic colossus, but a diplomatic and military dwarf. In comparison to the great powers of Europe or Japan, America was a minor actor on the world stage. That would all soon change. ‘Global America’ explores two phenomena—globalization and world war—that brought America deeper into world affairs. By the end of the period, in 1919, the United States had become one of the greatest powers of the world—and yet refused to play its part.