What makes a book a classic? I'm reading a "classice" amercian novel
and I'm supposed to tell why it's a "classic"

"What makes a book a classic?"
Dictionary definition: "of recognized value; serving as a standard of
excellence; traditional, enduring; an authoritative source."

A one of a kind book based on writing style and/or the ability to
evoke an era or situation. A remarkable ability to tell a great story.
An unusual insight into a set of circumstances. Not a trendy or
popular book of passing interest. The reader, once removed from the
writer's milieu, can still find wisdom, enchantment or understanding.
The book can pass the test of time.