These became the basis, when fitted into the overall geographical frame provided by the maps of the French geographer Guillaume Delisle.
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The map so impressed George Montagu-Dunk, 2nd Earl of Halifax, appointed president of the Board of Trade and Plantations in 1748, that Halifax opened up the official archives and solicited new maps from the colonies for Mitchell to make a new and better map.
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Benjamin Franklin and British representatives established the initial U.S. and Canadian borders in the Treaty of Paris in 1783 from the Mitchell Map of colonial American geographer John Mitchell, which mis-represented the source of the Mississippi River.