contained 20,000 residents, all crowded along the steep walls of the canyon, and natural disasters were a frequent occurrence. By the early 20th century, most of the mines in the county had closed. However, the Bingham Canyon Mine kept on expanding. In the early 21st century, it is among the largest open-pit mines in the world.

20th century

After the railroad came to the county, the population began to expand more rapidly, and non-Mormons began to settle in Salt Lake City. During the early

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