Everything Everywhere Daily · Tuesday, July 28, 2026
The Toledo War was significantly fueled by conflicting surveys of the border region between Ohio and the Michigan territory. An initial survey, influenced by the 1757 Mitchell Map, suggested the Maumee River would fall within Ohio. However, later surveys indicated the lake extended further south, potentially stripping Ohio of its Lake Erie shoreline and the crucial Toledo Strip. This led Ohio to include a provision in its state constitution to angle the border north of the Maumee River's mouth, a move Michigan territorial governor Lewis Cass contested by commissioning a second survey based on the original Northwest Ordinance line.
“All of this confusion stemmed from a map that was used at the time, known as the Mitchell Map, which was published around the year 1757.”
“The surveyor for the territory, General Edward Tiffin, was a former Ohio governor and was asked not to survey the border between Michigan and Ohio because that border was defined in the Ohio state constitution.”
“Michigan territorial governor Lewis Cass then challenged the survey and commissioned a second one, based on the original line as established in the Northwest Ordinance of 1787. This result, not surprisingly, came out in Michigan's favor, with the Maumee River's mouth lying in Michigan's territory.”