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In 1763 according to the terms of the Treaty of Paris, the British took possession of all French holdings east of the Mississippi River, including the North Shore. In 1784 the North West Company, the newly organized rival to the Hudson's Bay Company, started moving traders into its new fort at Grand Portage. With new headquarters on the North Shore, the North West Company began to build 40 new forts and ports all along the North Shore and northern Minnesota. In 1821 the North West Company was forced to merge with the Hudson's Bay Company.