Question: Gene Wolfe and Carson McCullers, are of which nationality?
Context: Carson McCullers (February 19, 1917 – September 29, 1967) was an American novelist, short story writer, playwright, essayist, and poet.  Her first novel, "The Heart Is a Lonely Hunter", explores the spiritual isolation of misfits and outcasts in a small town of the U.S. South.  Her other novels have similar themes and most are set in the deep South. Carson McCullers House is a historic home located at South Nyack in Rockland County, New York.  It is a two-story Second Empire style residence constructed in 1880 and modified with subsequent interior and exterior modifications largely in the Colonial Revival spirit about 1910.  It is a frame structure built originally as parsonage, three bays wide and four bays deep.  It features a one-story verandah, a slate-covered mansard roof, and an interesting multi-story tower projection crowned by a bell-cast roof.  It was home to noted author Carson McCullers (1917–1967) from 1945 to 1967. Gene Rodman Wolfe (born May 7, 1931) is an American science fiction and fantasy writer.  He is noted for his dense, allusive prose as well as the strong influence of his Catholic faith.  He is a prolific short-story writer and novelist and has won many science fiction and fantasy literary awards. The literature of Georgia, United States, includes fiction, poetry, and nonfiction.  Representative writers include Carson McCullers, Margaret Mitchell, Charles Henry Smith, and Alice Walker. "A Cabin on the Coast" is a science fiction / fantasy short story by Gene Wolfe, initially published in the February 1984 issue of The Magazine of Fantasy & Science Fiction and collected in "Endangered Species" (1989) and "The Best Of Gene Wolfe" (2009).  It was nominated for the 1985 Nebula Award for Best Short Story as well as the 1985 Locus award. The Castle of the Otter is a collection of essays and other non-fiction by Gene Wolfe, related to his Book of the New Sun tetralogy.  It takes its title from an incorrect announcement of Wolfe's final volume in "Locus".  "The Citadel of the Autarch" was the actual name of the final work in the series.  Wolfe liked the inaccurate title, though, and reused it as the name for a companion work of non-fiction essays and unused materials from the series (including an article about how "Otter" got its title). The Member of the Wedding is a 1946 novel by Southern writer Carson McCullers.  It took McCullers five years to complete, although she interrupted the work for a few months to write the short novel "The Ballad of the Sad Café". A Walking Tour of the Shambles (Little Walks For Sightseers #16) (2002), written by Neil Gaiman and Gene Wolfe, is a novel in the form of a tour guide concerning a fictional part of Chicago called 'The Shambles'.  It guides the reader through such non-existent landmarks as The House of Clocks (see the official website), Cereal House (home of the Terribly Strange Bed), and Gavagan's Irish Saloon.  A collaboration between Neil Gaiman and Gene Wolfe (cover by Gahan Wilson, with interior illustrations by Randy Broecker and Earl Geier), it was published with two different covers by the American Fantasy Press (one crediting "Gaiman and Wolfe", the other crediting "Wolfe and Gaiman". Clock Without Hands is American author Carson McCullers' final novel.  It was published on September 18, 1961 by Houghton Mifflin. Gene Wolfe's Book of Days is a short story collection by American science fiction author Gene Wolfe published in 1981 by Doubleday.
Answer: American