Minneapolis originated around a source of energy: Saint Anthony Falls, the only natural waterfall on the Mississippi. Each of the city’s two founding industries—flour and lumber milling—developed in the 19th century nearly concurrently, and each came to prominence for about fifty years. In 1884, the value of Minneapolis flour milling was the world’s highest. In 1899, Minneapolis outsold every other lumber market in the world. Through its expanding mill industries, Minneapolis earned the nickname “Mill City”. Due to the occupational hazards of milling, six companies manufactured artificial limbs.

Disasters struck in the late 19th century: the Eastman tunnel under the river leaked in 1869; twice, fire destroyed the entire row of sawmills on the east bank; an explosion of flour dust at the W

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