Science & Tech
9
During the 19th century, Chicago had the fastest growing population in the world. The river helped create a bustling economy but also required bridges. Chicago has the most moveable bridges in the U.S. and the most bridge design patents in the world.
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ExploreHere reads historical markers out loud as you pass them: over 325,000 stories across the US. No account needed.
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Chicago, Illinois · United States
