When Americans pay for something in other countries and they're asked if they would rather charge their accounts in the local currency or in U.S. dollars, only one correct choice will save money.
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Exchanging currency is a perennial pain in international travel. Fortunately for U.S. vacationers, there are a bunch of destinations, including many tourism heavy hitters, where no exchange is necessary. Often in an effort to protect against inflation or stabilize a rocky financial situation, as Western Union explains, several countries have adopted the greenback as their…