city and port, St. Lawrence county, northern New York, U.S. It lies on the St. Lawrence River, at the mouth of the Oswegatchie River and is linked to Ontario, Canada, by the Ogdensburg-Prescott International Bridge (1960). The site was settled in 1749 when Abbe Francois Picquet established Fort-La Presentation as an Indian mission. The French abandoned the fort in 1760 in the face of a British advance, and the British rebuilt it, renaming it Fort Oswegatchie, and occupied it until 1796; the ensuing settlement was named for Colonel Samuel Ogden, a landowner.
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