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.
The Met Gala has been going on since 1971. Thanks to the internet it is now one of the most anticipated A list events not only for those attending but also for those following fashion. Anna Wintour, the Vogue Editor in Chief has been chairing this event since 1995.