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The Webster–Ashburton Treaty, signed August 9, 1842, was a treaty that resolved several border issues between the United States and the British North American colonies (the region that became Canada). Signed under John Tyler's presidency, it resolved the so-called Aroostook War. The provisions of the treaty included:
The treaty also retroactively confirmed the southern boundary of Quebec that land surveyors John Collins and Thomas Valentine had marked with stone monuments in 1771–1773. The treaty intended that the border be at 45 degrees north latitude, but the border is in some places nearly a half mile north of the parallel. The treaty was signed by United States Secretary of State Daniel Webster and British diplomat Alexander Baring, 1st Baron Ashburton.