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 mis-represented the source of the Mississippi River.
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To reach the Angle by land, travelers take Minnesota State Highway 313 Northbound (Warroad, Minnesota to Sprague, Manitoba) across the border into Manitoba, Canada, connecting to Provincial Road 12 in Manitoba at the border, then to Provincial Road 308 Manitoba, to Provincial Road 525, then finally crossing back into the United States in the Northwest Angle south of rural Angle Inlet, Minnesota (Angle Inlet Township).
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The Danny Orlis series of books, a Christian fiction series for youth, were largely set in the Northwest Angle.
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In 1997, in order to change what were considered unequal fishing regulations between the U.S. and Canada, Angle resident Gary Dietzler utilized this cartographical mishap to implement a mock secession from the United States, going so far as to get a bill issued by their Congressman Collin Peterson (D) in the U.S. House of Representatives.
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The following year, U.S. Representative Collin Peterson of Minnesota proposed a constitutional amendment to allow the residents of the Northwest Angle, which is part of his district, to vote on seceding from the United States and joining Canada.
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In 1998, Peterson gained attention by proposing a constitutional amendment that would allow the residents of Minnesota's Northwest Angle to vote on whether they wanted to secede from the United States and join the Canadian province of Manitoba.