A war fought in 1835 between the State of Ohio and the Territory of Michigan over the city of Toledo. Due to inaccurate land surveys in the early 19th the southern tip of Lake Michigan was described as being in two different locations. Michigan's land grant stated that all of the land down to the southern tip of Lake Michigan belonged to the Territory of Michigan. Michigan, of course, claimed that the southern line was correct, while Ohio claimed that it was the northern line. this discrepancy resulted in a strip of disputed land known as the Toledo Strip. Toledo was the only city of note contained within the strip.
When it came time for Michigan to gain statehood, its borders had to be established. Michigan and Ohio could not compromise and Ohio's Governor Robert Lucas drew counties and set up county governments in the strip. Michigan's nineteen-year-old territorial governor Stephens T. Mason responded by sending a militia force to the area. Lucas did the same. The Toledo Strip was covered with dense cedar swamps at the time, which today they have almost all been drained off for farm land; the two armies got lost for weeks and never found each other in the swamps. Congress settled the issue by awarding Toledo to Ohio but by giving Michigan the upper peninsula. Ohio was considered the winner because the "U.P." was thought to be worthless; only later was the extant of its rich mineral resources known.