That time Ohio and Michigan sparked an angry border war
Forget Texas and Oklahoma, Alabama's internal division, or even the rivalry between the Army and the Navy academies. There's only one state rivalry that ever erupted into armed conflict: the Ohio State-Michigan rivalry.
The reason? Toledo.
Admittedly, the war wasn't over football.
The spike in tensions was about not just the city of Toledo, but the entire area covered by a portion known as the Toledo Strip. In 1835, Michigan wanted to become a state but it had to settle ownership of Toledo first.
It may not be the city it once was (and the video below acknowledges that) but the strategic importance of the city meant control of the Lake Erie coastline and complete control of the Maumee River, a critical trade and transportation hub.
The Toledo War (as it came to be called) sparked more than just a long-lasting rivalry. Ohio's importance as a swing state for Andrew Jackson's Democrats led to political corruption that put the Toledo area in Ohio's borders, even though Michigan was (technically) right.
At this point, it's important to tell the reader that this author and the narrator of the video below are both Ohioans.
The "war" did turn into armed conflict, firing a total of 50 bullets and injuring one militiaman in the leg. And Jackson removed the governor of Michigan. At the time Michigan was a U.S. territory, so its governor was a Presidential appointee, which is how Jackson was able to sack him.
But while Ohio won the war for Toledo, Michigan gained its statehood AND its resource-rich upper peninsula as an extra point.
The record remained 1-1 for another 60 years when the states began to settle their scores through college football.