The California Gold Rush, the construction of railroads and a growing pioneer spirit all contributed to the expansion of the "wild west."
加州淘金热、铁路的建造、日益增长的拓荒精神都为向“蛮荒西部”扩张做出了贡献。
The California Gold Rush, the construction of railroads and a growing pioneer spirit all contributed to the expansion of the "wild west."
加州淘金热、铁路的建造、日益增长的拓荒精神都为向“蛮荒西部”扩张做出了贡献。
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