1. 1805: Lewis and Clark Expedition reaches the Pacific Ocean at the mouth of the Columbia River in Clatsop County. 2. 1811: Fort Astoria is established by John Jacob Astor's Pacific Fur Company at the mouth of the Columbia River. 3. 1846: The Oregon Treaty is signed, establishing the U.S.-Canada border along the 49th parallel, which runs through Clatsop County. 4. 1851: The first permanent whi...
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