A citizen of the United States is an American. United States, American and U.S. refer to the country adjectivally (American values, U.S. forces). American rarely refers to subjects not connected with the United States.
Costume Department | Actress. Anna Wintour was born in Hampstead, London, England, the daughter of an American mother, Eleanor Trego (Baker), and an English father, Charles Wintour, former Editor of the Evening Standard. She is from an upper-class family, with many prominent ancestors.
Power Dressing: Anna Wintour's Favourite Necklace. (Clockwise from top left) Anna Wintour at New York Fashion Week; with her daughter Bea at London Fashion Week; at Milan Fashion Week; with Vogue's Hamish Bowles at Paris Fashion Week. That American Vogue's Anna Wintour loves her crystal statement necklaces is very well documented. That she loves this particular piece, she wore it to each of the top four fashion weeks - New York, London, Milan and Paris - almost every day we did not know.