In the 1860s and 1870s,Nevada's Comstock Lode,Colorado's Rocky Mountains,and South Dakota's Black Hills were all known for

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These areas were all known for mining during the 1860s and 1870s. The Comstock Lode was a major silver mining area in Nevada, the Rocky Mountains had gold and silver deposits, and the Black Hills were famous for gold mining. Sheep raising, cattle grazing, and frontier farming were more common in other regions during this time period.