Coco82 said:
I'm not saying I want to write the great American novel, but I was thinking what qualiites, themes, do these novels have in common?
I think the themes/qualities change as culture does. At some point 'coming of age' novels seemed to have a good chance to become a classic, but anymore I think we as a nation have seen enough offerings to feel inured to it.
For the sake of argument, I'll throw out a couple that I think help:
* Sweeping backdrops (Civil War, the gold rush, sometimes not even a major event.)
* Authenticity to the time period
* Promotion by a validated source (hype can go a long way)
It might be easier to take a look at the books you think are classics and determine what the common factors are.