How did railroad companies help to encourage settlement of the Great Plains? What other human geographic factors affected settlement of the Great Plains?

Rail road companies facilitated settlement of the Great Plains because it provided a means of transportation for settlers to get to the location. The government had also provided land to these companies which they sold at an affordable cost to the new settlers. The area was a large expanse of flat land making it easy for newcomers to establish agriculture.

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an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.