Not to beat a dead horse, here, but everybody seems to be pretty darn close-minded and I'm getting pretty sick of it. I always had rather cosmopolitan aspirations, but honestly, after working with foreigners from all over the world, I've got to say, I'm generally tired of this whole entire "us vs. them" mentality that many of them have when they come to my country. I'm a person who always wanted to develop meaningful friendships with foreigners, not just shallow acquaintanceships. Your nationality is part of your personal makeup, but it is not what solely defines you.
And as for Japanese and Korean Americans... you are Americans first, in my opinion. Like Margaret Cho's joke, your native language is American English. You watch American television, listen to American songs. Your families have found freedoms (socially, religiously, and politically) when you came to America. Just like mine. If Americans should argue, it should be about America, not about Korea and Japan. It doesn't matter if you are Korean, black, Japanese, German, Italian, Irish, mulatto, Cherokee, Hispanic, or white Anglo-Saxon, gay/lesbian or straight, Muslim, Catholic, Protestant, or pagan, so long as your hearts were as American as Levi jeans and apple pie.
Not every American would agree with me. But that's what I think.
Whatever the Koreans think of Japanese Americans is irrelevant, as far as I am concerned. When you come to America, become a citizen, and pledge allegience to the flag, you are American, and anyone who has anything else to say about it can get bent.