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a doctor named John Emerson.
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Emerson was an army surgeon,
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and Emerson traveled from Missouri
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all over the upper Midwest
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and into what then was the Great Plains
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as an army surgeon working at army camps and bases.
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Dred Scott went with him as his personal servant.
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They traveled to Illinois and Minnesota.
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Dred Scott lived with his master from 1834 to 1838, four years,
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with Dr. Emerson, on various kinds of military bases,
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especially in Minnesota, a free territory.
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At one point, Dred Scott tried to buy his own freedom in Minnesota