Italy is the country that changed sides about a year after World War I began and joined new sides. Italy was actually part of an alliance that included the countries of Austria-Hungary and Germany. It was actually part of the Triple Alliance before World War I. I hope the answer helps you.
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The reason why we need a system of currency exchange in order to conduct international trade is because different countries use different types of currency. They do so because national sovereignty allows each nation to establish its own currency. However, we need a system to pay for goods that are purchased from other countries. This is why the currency exchange system allows us to conduct international trade
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