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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. It established the border between Lake Superior and the Lake of the Woods, originally defined in the Treaty of Paris (1783), reaffirmed the location of the border (at the 49th parallel) in the westward frontier up to the Rocky Mountains defined in the Treaty of 1818, defined seven crimes subject to extradition, called for a final end to the slave trade on the high seas, and agreed to shared use of the Great Lakes. The treaty was signed by United States Secretary of State Daniel Webster and British diplomat Alexander Baring, 1st Baron Ashburton.〔.〕 ==In the East== The treaty incorporated a geographic oddity. Since "Fort Blunder", an unnamed U.S. fort in what is now part of northeastern New York, had been inadvertently constructed on Canadian soil, the northern border of New York between the Saint Lawrence River and the New York–Vermont line was adjusted 3/4 of a mile northward, beyond the 45th parallel, to incorporate the half-finished and abandoned fort on US soil. Following the signing of the treaty, construction was resumed on the site. The new project replaced the aborted 1812-era construction with a massive third-system masonry fortification known as Fort Montgomery.〔 This treaty marked the end of local confrontations between lumberjacks (known as the Aroostook War) along the Maine border with the Canadian provinces of Quebec and New Brunswick. It also resolved issues that had led to the Indian Stream dispute as well as the Caroline Affair. The border was fixed with the disputed territory divided between the two nations. The British acquired the Halifax-Quebec road route their military desired because it gave a wintertime connection from Quebec to New Brunswick and Nova Scotia. Portions of the US-Canada border were adjusted so as to give the U.S. a little more land to the north. The Webster–Ashburton Treaty failed to clarify ownership of Machias Seal Island and nearby North Rock, which remain in dispute today.〔 Additionally, the signing of the treaty put an end to several building improvements planned for Upper Canadian defense forts such as Fort Malden in Amherstburg, which as a result was later abandoned by the British government when it no longer served a defense purpose. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Webster–Ashburton Treaty」の詳細全文を読む スポンサード リンク
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