It was already hard for other countries to pay back their war debt to U.S., worsened by the previous, so the Dawes plan, which cycled money between the U.S., Germany, and Allies, was successful in fixing this problem until the Great Depression and it was unsustainable because new money doesn't get introduced, so it's like the debt is just continuously shifted around and left no money to be used to trade and created a dependency on U.S. finances
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