Exploration & Discovery

David Thompson Claims Columbia District for Britain

Explorer David Thompson planted a sign near what is now Sacajawea State Park in Washington state, formally claiming the Columbia District for the United Kingdom. This act was part of Thompson's exploration efforts as a representative of the Northwest Company, aimed at asserting British interests in the Pacific Northwest amidst growing tensions of American expansionism. The location was significant due to its proximity to the confluence of the Columbia and Snake rivers, which were vital for trade and exploration.

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