Mitchell Map

The Mitchell Map is a map made by John Mitchell (1711–1768), which was reprinted several times during the second half of the 18th century. The Mitchell Map was used as a primary map source during the Treaty of Paris for defining the boundaries of the newly independent United States. The map remained important for resolving border disputes between the United States and Canada as recently as the 1980s dispute over the Gulf of Maine fisheries. The Mitchell Map is the most comprehensive map of eastern North America made during the colonial era. Its size is about 6.5 feet (2.0 m) wide by 4.5 feet (1.4 m) high.

John Mitchell was not a professional geographer or map maker. Son of a wealthy Virginian family in Lancaster County, on Virginia's Northern Neck, he had been educated at Edinburgh University, Scotland; this education included the first two years of the three-year medical program. Returning to coastal Virginia, he practiced as a physician and studied the local botany. Ill health forced Mitchell and his wife to leave Virginia for London in 1746. There, he served as a consultant on exotic plants to noblemen interested in gardens. Also, it was there that Mitchell would make his famous map. Map historians have understandably been interested in why a physician and botanist who had shown no previous interest in map making should make such a large and detailed map.

Until recently, historians have argued that Mitchell was upset by the lack of interest shown by politicians in London about colonial affairs and so set out to warn them about the dangers posed to the British colonies by the French. Mitchell did so, on his own initiative, by making a first map of North America in 1750, which he then showed to the politicians he knew through his botanical and gardening activities. 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. This was the map published in 1755. That is, the motive force for preparations against the French threat is understood to have come from a colonist who sought to take control of the colonies' future on behalf of the other colonists. (See, for example, the accounts by Ristow and Berkeley & Berkeley.)

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