Places were major mines existed included California, Nevada, Montana and the black hills of Dakota.
In the 19th century, the United States of America had the coal industry as a major driver of American Industrialization. Coal from the mines were used for technology, transportation and energy.
The growth of the coal industry in the nation helped to spur the country on a path of industrialization and growth.
In conclusion California, Nevada, montana, and the black hills of Dakota.
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