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What was the United States claim to the organ territory based on

User Les Vogel
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Answer:

The U.S. claim was based on the explorations of Lewis and Clark and on the establishment of trading posts set up by John Jacob Astor's Pacific Fur Company, such as Astoria at the mouth of the Columbia River. Great Britain based its claim, in part, on James Cook's exploration of the Columbia River.

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User Tom Lubenow
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