Final answer:
During the War of 1812, John Jacob Astor was forced to sell Fort Astoria to the British, but the Treaty of Ghent in 1814 returned the disputed Oregon region to the United States.
Explanation:
During the War of 1812, John Jacob Astor was forced to sell Fort Astoria, which was occupied by the British and renamed Fort George. The Treaty of Ghent in 1814 settled the war with Britain, restoring all disputed territory in the Oregon region to the United States government.
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