An interesting thread. I would suggest that saying jazz is considered America's only true art form makes one question the definition of 'art form'.
Among music, bluegrass and musicals are certainly also native to the United States. The problem with most other 'art forms' is that if you define them broadly enough, like 'painting', the USA is obviously too young a region. If one goes more detailed, there are plenty.
Among music, bluegrass and musicals are certainly also native to the United States. The problem with most other 'art forms' is that if you define them broadly enough, like 'painting', the USA is obviously too young a region. If one goes more detailed, there are plenty.