There is a Japanese similarity there, granted. I did say indigenous, meaning the original inhabitants, but I'll take your word on the fact about the many tribes and their being not one 'race'. Same could be said for our aboriginals, who more than likely came from around India some 30,000 years ago.
Still when you put that argument about the origins of the indian people into perspective, it totally fucks up Jap boy's argument about anything from the American continent being what he claims it to be. Also, he should look at the Hawaiian peoples as well, who have some Japanese blood mixed with Polynesian. They go back at least 500 years or more, well before Cook claimed the islands for Britain and named them the Sandwich Islands.