Why did Minneapolis' flour boom go bust?

Minneapolis' "Mill City" nickname traces its roots to a 50-year period when the city's flour milling dominated the world market. But that came to an end in 1930, when the city lost its crown to Buffalo, N.Y. Eric Roper and Hannah Sayle discuss how Minneapolis rose to prominence as a flour milling capital, and the many factors that led to the decline of flour milling on the riverfront.

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Why did Minneapolis' famous flour boom go bust?