11. . . . has the longer river that shares its name?
Ohio River: 981 miles Michigan River(Colorado): 69 miles
Michigan
Ohio
12. . . . has the larger lake that shares its name?
Lake Michigan is 22,404 sq mi. There is no significant lake named "Lake Ohio" (or "Ohio Lake").
Michigan
Ohio
13. . . . "won" the Toledo War (by getting Toledo)?
Michigan
Ohio
14. . . . has more wins in the University of Michigan-Ohio State University football rivalry?
Despite Ohio State's recent dominance (15-2 since 2001), Michigan still leads 58-50-6.
Michigan
Ohio
15. . . . has won more NFL championships?
The Cleveland Browns and the Detroit Lions have 4 each, but Ohio also claims championships by the Canton Bulldogs (2), Akron Pros, and Cleveland Bulldogs. Neither state has ever won a Super Bowl.
Michigan
Ohio
16. . . . has a more recent World Series win?
Cincinnati Reds: 1990 Detroit Tigers: 1984
Michigan
Ohio
17. . . . has the highest ranked university (according to U.S. News and World Report)?
University of Michigan: #25 Case Western Reserve University: #40
Michigan
Ohio
18. . . . has a greater percentage of its population employed in manufacturing?
Michigan: 18.8% Ohio: 15% (both states are Top 5 in the U.S.)
Michigan
Ohio
19. . . . is closer to Toronto (as the crow flies)?
Conneaut, in the NE corner of Ohio, is 131.95 miles from Toronto. Port Huron, along the Canadian border, is 160 miles from Toronto. These may not be the absolute closest possible points, but I am confident that no point in Michigan is closer than the closest point in Ohio.