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Treaty of 1846
Treaty between American and Britain over the Oregon Territory -
Mexican cession
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Kindred Spirits by Asher Brown Durand
Oil on Canvas -
Period: to
Construction of the Transcontinental Railroad
A 1,907 mile (3,069 km) contiguous railroad line -
Twilight on the Plains, Platte River, Colorado by Worthington Whittredge
Oil on canvas -
The First Transcontinental Railroad
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Yellowstone National Park was created.
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Colorado became the 38th state.
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Green River, Wyoming by Thomas Moran
Oil on Panel
