Even though the United States refused to sign the Versailles Treaty, thereby isolating themselves diplomatically, they
were still very much involved in the world how?

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Answer:

Even though the United States did not sign up for the security that the Versailles Treaty offered, they still played a big role economically around the world after World War I. The United States became the world's leading economic power after WWI. They were a major creditor to the defeated nations in Europe.

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