No expert here but I think in part because of its dominant role as a medium of exchange, the U.S. dollar is also the dominant currency in international banking.
Additionally, the relative strength of the U.S. economy supports the value of the dollar. It’s the reason the dollar is the most powerful currency. As of the end of 2020, the U.S. had $2.04 trillion in circulation. As much as half that value is estimated to be in circulation abroad.
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