Postcard
Worth $3-8 · asking-price comps, September 2026
In 1917, Denver was experiencing rapid growth as a major railroad and mining hub in the American West, with the city serving as a gateway to Colorado's natural resources and emerging tourist attractions. The opening of Rocky Mountain National Park that May represented a significant moment in the early conservation movement, reflecting growing national interest in preserving wild landscapes while promoting western tourism and economic development.
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