The City of New York is the most populous city in the United States, and the center of the New York metropolitan area, which is among the most populous urban areas in the world. A leading global city, New York exerts a powerful influence over worldwide commerce, finance, culture, fashion and entertainment. As host of the United Nations headquarters, it is also an important center for international affairs. The city is often referred to as New York City to differentiate it from the state of New York, of which it is a part