The first mining boom in American history was not the California Gold Rush, the Klondike Gold Rush, or any other gold rush. The first mining boom in American history was the copper rush of the uppermost part of the Upper Peninsula, the Keweenaw peninsula. And by the time it was over, this boom actually had a greater economic impact than either of those gold rushes.
In fact, from the 1860s to the 1920s, this part of Michigan supplied over 90% of the world's copper.
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