The Treaty of Washington, better known as the Webster–Ashburton Treaty, signed August 9, 1842, was a treaty resolving several border issues between the United States and the British North American colonies. Signed under John Tyler's presidency, it resolved the Aroostook War, a nonviolent dispute over the location of the Maine–New Brunswick border. The maps in this series are among the original supporting documents for the Treaty. Each is hand drawn, hand colored and signed by Major J. D. Graham, Principal Astronomer and head of the Scientific Corps.
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