A plan of the division line between the provinces of New-York and Quebec. In the 45th degree of north latitude. Survey'd in the year 1771 & 1772. Courtesy of the Library of Congress

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A plan of the division line between the provinces of New-York and Quebec. In the 45th degree of north latitude. Survey'd in the year 1771 & 1772. Courtesy of the Library of Congress

The Collins-Valentine Line of 1774 established the boundary between the provinces of New York (then including Vermont) and Quebec. This boundary was later confirmed by the Webster Ashburton Treaty of 1842, by which time Vermont had become a separate state.