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The United States passed the Prairie Settlement Act, which encouraged colonists to settle on the Great Plains in order to promote the Western frontier.
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After the end of the American Civil War, the military and civilians began to expand and settle in the West, promoting the development of the Great Plains.
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The first railroad companies begin to build railroads across the Great Plains, making it easier for settlers to enter and settle in the region.
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With the construction of railroads, agricultural technology, and water facilities, a large influx of people into the Great Plains led to the construction of towns and farms.
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Indian Wars break out in the Great Plains, with some Native Americans resisting white invasion and occupation, leading to a series of clashes and massacres.