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Alexander Mackenzie (born 1763/64, Stornoway, Isle of Lewis, Scotland—died March 11/12, 1820, near Dunkeld) was a Scottish fur trader and explorer who traced the course of the 1,100-mile Mackenzie River in Canada. Immigrating to North America, he entered (1779) a Montreal trading firm, which amalgamated with the North West Company, a rival of the Hudson’s Bay Company. In what is now the province of Alberta, Mackenzie and a cousin set up a trading post, Fort...