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The only surviving fortification of the Aroostook War, the nonviolent confrontation over the border between Maine and New Brunswick.

The Fort Kent Blockhouse is located at the confluence of the Fish River and the St. John River in Fort Kent, Maine. The blockhouse is the only fortification relating to the "Bloodless" Aroostook War of 1838-1839, and the border dispute between Great Britain and the United States. The signing of the Webster-Ashburton Treaty in 1842 settled the boundary dispute between Maine and New Brunswick and reduced the need for a fort, although federal troops remained there until 1845 to protect Maine's and the United States' interests in the region.