The Grid is a set of imaginary lines that have been emblazoned onto the land itself. From Chicago streets to county roads, Isaac Newton’s coordinate grid is a fact of life for anyone who lives in Chicago Land. This is the third episode in a four part series.

Chief Blackhawk didn't believe land could be bought and sold. The U.S. Army set out to prove him wrong and, in the process, discovered a nifty little harbor with the potential to unite the Mississippi and Great Lakes watersheds.

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