So you replace the Korean culture of Tae Kwon Do, a culture that goes back 2000 years at least,
Korean culture is ancient. TKD is, by all well-researched, documented, peer-reviewed accounts, a very recent import to Korea. The ancient history of Korea does not translate into an ancient history for TKD, any more than it translates into an ancient history for the internal combustion engine, eh? Let's try to keep our categories of things straight.
and replace it with what? Self defense? Tae Kwon Do has that. American forms? What exactly are those?
The self-defense inherent in the TKD forms is essentially the same self-defense that bunkai for the Okinawan/Japanese
sources of TKD reveal for the karate that went to Korea and
became TKD in the 30s and 40s. The forms are either the same, or remixed subsequences from the same karate forms. The general strategic principles built into the hyungs are no different from those of the O/J kata, though certain details of execution may be (slightly) different; see Stuart Anslow's 2006 book on bunkai for the Chang Hon tuls for a nice comparison between Shotokan and ITF TKD techs to see how small-scale the differences really are.
As for American forms... no one is talking about American hyungs, YM. You seem to think that that's what 'Americanize' means, but that's not the case. 'Americanize' means, bring an American perspective to the TKD technique set, and use that technique set in a way that coincides with American views of the martial arts, self-defense, street violence and self-protection. It doesn't mean creation of new forms. The Japanese took karate from the Okinawans but did not significantly change
any of the forms, so far as I know, though there are of course variant forms for all of them (and that goes on Okinawa as well as in Japan). The Koreans, as Gm. Kim notes, were doing the same Japanese karate forms as the Japanese in the 40s and 50s. But the Japanese and Koreans developed different views of karate from the Okinawans, who themselves developed different views of the MAs from the Chinese whose arts they merged with their own indigenous combat systems to give rise to karate. Everyone has a different perspective, based on their own needs and cultural attitudes.
And that's the point here: what happened in those cultures is bound to happen in all other places which these arts spread to.
Anyway, Korean reoriented Tae Kwon Do with Korean culture because they viewed the Japanese as usurpers and invaders. We've never invaded conquered Korea.
Yes. And as is implicit in what you say, we have no particular reason to adopt either their point of view or that of the Japanese. Our history touches theirs only marginally, in terms of our sense of our own national experience. We have no stake in their conflicts apart (I would hope!) from a sense of outrage as we learn in more detail just what the Japanese militarists did to the people whose countries they occupied, but I feel exactly the same way when I read about what the Romans did to the British Celts a couple of millenia ago. We have no reason of our own to buy the Korean rejection of the Japanese elements in the MA they
got from the Japanese.
I'm still interested to know what the American version of Tae Kwon Do is.
I believe it is emerging: emphasis on steet-practicality, awareness of the realistic bunkai interpretations that have begun to become widely available, especially as a result of the British MA community's investigations; a new emphasis on two-person training in common street-attack scenarios, aka reality-based scenario drills of the sort that Peyton Quinn advocates in his writing...
... and most of all, recognition of TKD as a set of combat techniques, to be studied and trained for real combat. That's not the only take on TKD out there, and I see no reason why different perspectives cannot coexist happily. But like it or not, YM, you are going to see this point of view emerge more and more over the next decade. This is what we've done with everything that comes our way: reinvent it to our own purposes. And this case is not going to be an exception. Take a look at the thread Terry recently started on new direction in TKD organizations (don't have a link at hand, sorry... will try to dig it up). That is the handwriting on the wall.