I haven't read the entire thread, I don't really have the heart to as I can tell it would be pretty fruitless to. But as to the names of some great American authors...

Theodor Seuss Geisel or as most know him, Dr. Seuss. I'm sure numan will poo poo him, but his name will outlast most, he was both an author and artist. And his papers are housed where I work, UCSD.
Now for stuff that numan might consider more *ahem*... cultured... may I point at UCSD's Archive for New Poetry Almost all American, some well known, some not, but poets often aren't except for those in the field.