What type of economic integration most accurately describes the United States' economy?

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An area with free trade agreements onlyA group of countries with a shared external tariffA market allowing free movement of goods, services, labor, and capitalA union where member countries share a common currencyA full political and economic union

Explanation

The United States operates under a monetary union, as it uses a single currency (the U.S. dollar) across all states, unlike free trade areas or customs unions which do not involve a common currency.