Silver and gold strikes that built cities overnight — and broke treaties just as fast.
Each bonanza faded — Comstock by 1880, Deadwood industrialized, Tombstone drowned — but Denver, Virginia City and the seized Black Hills remained.
The atlas holds 2 border frames for Mining Rushes — the shape you scrub through changes in 1858 · 1874.
The Black Hills gold rush and the treaty it broke — a case study of the mining-rush era.
The boom-and-bust mining culture that built western cities overnight (broad context).