Ernest Hemingway was indeed an author of several novels: The Sun Also Rises, For Whom the Bell Tolls and the Old Man and The Sea, among others. He was an expatriate because he was disallusioned with America's participation in WWI. He gave up his citzenship and moved to Paris, with a lot of other writers, who became known as the Lost Generation. Someone who gives up their citizenship is known as an expatriate.
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