After World War II,the U.S.dollar was to become the main,official "reserve currency of the new international order," according to Hughes and Cain (2011).

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This statement is true. After World War II, the United States emerged as a dominant economic and military power, and the U.S. dollar became the main reserve currency for international transactions and central bank reserves. This was formalized at the Bretton Woods conference in 1944, where most major countries agreed to peg their currencies to the U.S. dollar, which in turn was pegged to gold. This system lasted until the 1970s, when the U.S. ended the convertibility of dollars to gold and moved toward a floating exchange rate regime. However, the U.S. dollar remains the dominant reserve currency and is widely used in international trade and finance.