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Francois and Louis de la Verendry explore the northern Great Plains.
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Eastern Montana, as part of the Louisiana Purchase, becomes U.S Territory.
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Lewis and Clark travel through Montana on their expedition through the Northeast.
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Manuel Lisa builds first fur-trading post; John Colter crosses the area of present-day Yellowstone National Park.
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Gold is discovered at Gold Creek
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Congress establishes Yellowstone National Park, the county's fist national park
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Sioux and Cheyenne Indians defeat George Custer in the Battle of Little Bighorn
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Montana becomes the 41st state
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Voters select Helena as the capital
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Congress establishes Glacier National Park