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The Northwest Angle, known simply as the Angle by locals, and coextensive with Angle Township, is a part of northern Lake of the Woods County, Minnesota. Except for minor surveying errors, it is the only place in the United States outside Alaska that is north of the 49th parallel, which forms the border with Canada from the Angle west to Washington State. It is one of only six non-island locations in the 48 contiguous states that are exclaves of the U.S. although not directly connected to them by land. At 49.22° north latitude, it is the northernmost township in Minnesota and the northernmost point in the contiguous 48 states. The unincorporated communities of Angle Inlet and Penasse are located in the Northwest Angle. Seventy percent of the land of the Angle is held in trust by the Red Lake Indian Reservation (Ojibwa). Although the Angle is listed as one of several distinct regions of Minnesota, its total population was 119 at the 2010 census. The land is mostly forest and the area is mostly water. ==Origin== The initial establishment of Angle Township being in the United States was due to a map-maker's error. Benjamin Franklin and British representatives established the initial U.S. and Canadian borders in the Treaty of Paris in 1783 from the Mitchell Map of colonial American geographer John Mitchell, which misrepresented the source of the Mississippi River. The Treaty of Paris, concluded between the United States and Great Britain at the end of the American Revolutionary War, stated that the boundary between U.S. territory and the British possessions to the north would run "...through the Lake of the Woods to the northwestern-most point thereof, and from thence on a due west course to the river Mississippi..." The parties did not suspect that the source of the Mississippi River, Lake Itasca (then unknown to European explorers), was south of that point. The entire Mississippi was too far south to be intersected by a line running west from the Lake of the Woods. The parties had used the Mitchell Map during the treaty negotiations; that map showed the Mississippi extending far to the north. In the Anglo-American Convention of 1818, the error was corrected by having the boundary continue due south from the northwest point of the lake to the 49th parallel and then westward along it. The Webster–Ashburton Treaty of 1842 reaffirmed this border. When a survey team led by David Thompson finally located the northwestern-most point of the lake and surveyed this north–south line, it was found to intersect other bays of the lake and therefore to form the boundary of a section of U.S. territory to its east, now known as the Northwest Angle. 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「Northwest Angle」の詳細全文を読む スポンサード リンク
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