11% of the land, 3% of the people, they are called "yoopers"
When the Michigan Territory was first established in 1805, it included only the Lower Peninsula and the eastern portion of the Upper Peninsula. In 1819, the territory was expanded to include the remainder of the Upper Peninsula, all of what later became Wisconsin, and part of Minnesota (previously included in the Indiana and Illinois Territories). When Michigan applied for statehood in the 1830s, the proposal corresponded to the original territorial boundaries. However, there was an armed conflict known as the Toledo War with the state of Ohio over the location of their mutual border. Meanwhile, the people of Michigan approved a constitution in May 1835 and elected state officials in late autumn 1835. Although the state government was not yet recognized by the United States Congress, the territorial government effectively ceased to exist. President Andrew Jackson's government offered the remainder of the Upper Peninsula to Michigan if it would cede the Toledo Strip to Ohio. A constitutional convention of the state legislature refused, but a second convention, hastily convened by Governor Stevens Thomson Mason, consisting primarily of his supporters, agreed in December 1836 to the deal. In January 1837, the U.S. Congress admitted Michigan as a state of the Union.
tl/dr: michigan traded toledo to ohio for the UP