The Thunder Bay River Boundary of the Cession of 1819 was the last Michigan treaty to be negotiated in the state. It ceded important area of Michigan from the Chippewa, Ottawa and Potawatomi tribes to the United States. Six million acres with the Thunder Bay River as the northern boundary. The plaque on the second avenue bridge identifies this boundary. The treaty was significant in establishing areas for white settlers and in the use of the Michigan baseline as a standard in surveying.
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