Rant - Japanese Manga Monopoly

I like manga and anime and I have no racial prejudice against Japan, but there is one thing that pisses me off about them: their manga monopoly. It's rather stupid if you ask me that only Japanese can make manga. I know, it's part of their culture, but you certainly don't see Americans holding a monopoly on rap (it occurs in many places outside the US now).

>>US culture is inferior.

Does the U.S. even have a culture of its own?