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There were people at least semi-seriously proposing Chinook Wawa as the international language in the 1890's and I think they had a better case.
I think there are two basic theories about Chinook Wawa, one is that it is a contact language that came about with europeans coming to trade and another that it is a trade language that adapted to English and French.
Of course, the people who recorded Chinook Wawa were Europeans, so there is a strong bias for the informant to present Chinook Wawa words that are understandable to the person asking, and it is really difficult to figure out what NA language is the base.