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Just after the Revolutionary War, the United States gained official control over the land west of the Appalachians.
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In 1803, the United States purchased approximately 827,000 square miles of land from France for $15,000,000.
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Lewis and Clark begin their expedition to explore land acquired by the Louisiana Purchase. Officially titled the Corps of Discovery.
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In 1821, Missouri was admitted into the United States of America as the 24th state.
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James K. Polk announces war upon Mexico.
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"A Tight Fix -- Bear Hunting, Early Winter (The Life of a Hunter: A Tight Fix) This painting was created in 1856 by Arthur Fitzwilliam Tait.
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Backwoods America Jasper Francis Cropsey painted this western scene in 1858.
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Indian Encampment, Late Afternoon Painted in 1862 by Albert Bierstadt.
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