Your sementical argument is flawed and fail Pavo.
American is not the demonym your culture uses to identify yourself, you're a Dominican. A resident of Mexico is a Mexican, a resident of Canada is a Canadian, et al. The only specific country that uses the term American by itself as a noun is for a citizen of the United States of America, because there is no other country in the Americas that actually has the name "America" in it.
There's an entire series of wikipedia arguments on the subject, http://en.wikipedia.org/wiki/Use_of_the_word_American, http://en.wikipedia.org/wiki/Names_for_Americans everyone can go knock yourself out over the subject there because it's off topic in this thread.
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