It usually features shrimp and chorizo, while the classic Valencian paella has chicken and rabbit. (There are many regional paella variations but don't tell a Valencian that.)
So chorizo is a local American ingredient? Americans expect chorizo on their paellas because that's one of the few things they know about Spanish cuisine. It's just like them expecting Italians to only eat pizza and pasta, when that's a very small part of the Italian cuisine.
