What makes a poem, a short story, a novel, or any other

What makes a poem, a short story, a novel, or any other written work “American literature
What makes a poem, a short story, a novel, or any other written work ““? Does it have to be written by an American author? Must it be set in America? Are all of the characters Americans? Or do you believe that all works of American literature share certain values, themes, and ideals? What does “American literature” mean to you?
 
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