You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: 19th CENTURY AMERICA 
Clue: This politician died on June 3, 1861, 39 days after giving a speech in Springfield, Illinois supporting the Union
stephen douglas

Category: AMERICAN NOVELISTS 
Clue: "What is moral is what you feel good after and what is immoral is what you feel bad after", he wrote in 1932
ernest hemingway

Category: CARTOON SCIENCE 
Clue: According to Chuck Jones, whenever possible, this force of nature was to be Wile E. Coyote's greatest enemy

gravity