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By the 1840s the influx of p________ to the Northwest, and the flood of prospectors to Cal

3. By the 1840s the influx of p________ to the Northwest, and the flood of prospectors to California after 1848 had created an increasing demand for mail delivery to and from the East. (--the first people to go to a particular area in order to live and work there)

提问人：网友cqbocl 发布时间：2022-01-07

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