If you have to ask then there's nothing I could do to explain it. Get out of NYC and spend some time in South Carolina or Arkansas, then you'll find out.
American culture:
The Constitution
Baseball
Football
Basketball
Country Music
Blues
"No King But Jesus"
The Young Men's Christian Association
Route 66
BBQ
Philly Cheese Steaks
Hollywood (yes, at it's best and worst)
Broadcast TV
NASCAR
USMC
Detroit Steel
Chicago Deep Dish
Dallas Cowboys
American Calvinism
The Evangelical Movement
.....wow....I could go on and on.