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.
Camilla Nickerson, Vogue's senior fashion editor, made her career by styling eccentric, in-your-face shoots for British magazines like The Face. An early peddler of heroin chic, Nickerson was soon snapped up by Vogue's Anna Wintour to work on the other side of the Atlantic.