By 1900 the United States had already displaced the entirety of the British Empire as the world’s single-largest economy. Furthermore, the Americans didn’t even join World War I until three years in, and so were able to serve as creditor to the Europeans rather than needing to debase their currency to keep fighting. The British pound wasn’t as debased as the franc or deutschmark or ruble, but the dollar wasn’t debased at all.* Even better, the Americans were perfectly willing to provide the World War II Allies with anything they needed—oil or fuel, steel or guns, wheat or flour—so long as they
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