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In 1845, the Illinois legislature gave Forbes the right to construct a permanent dam and millrace at the site, but eight years later he sold all his holdings on the Aux Plaines and also the right to operate the dam.
With the advent of the construction of the Illinois and Michigan Canal in 1836, many new settlers came into the area. Concerned about the ability to farm the increasingly crowded land, the young men of the Forbes family and their families left the area one by one and headed futher west.
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