The largest construction project on American soil by 1870 was the

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The Brooklyn Bridge, completed in 1883, was the largest construction project on American soil up to that point. It was a technological marvel, spanning the East River connecting Brooklyn and Manhattan, and serving as a symbol of American ingenuity and progress. The San Francisco Bridge did not exist until the Golden Gate Bridge was completed in 1937, while the Mackinac Bridge and Washington Bridge were both completed after 1870.

The Largest Construction Project on American Soil by 1870 Was