From Ohio History Central
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The Whig Party proved to be strongest in New England and the Mid-Atlantic states, although Whig candidates had strong showings in the South as well as in the Midwest. In Ohio, many voters supported the Whigs and their call for internal improvements. Joseph Vance, a Whig, became the first Whig governor of Ohio in 1836. The Whig Party also dominated the Ohio legislature at this same time. The Panic of 1837 caused Ohio voters to replace Vance with Democrat Wilson Shannon and to replace the Whig majority in the legislature with a Democratic one. As the state's economic conditions improved, Ohioans returned a Whig, Thomas Corwin, to the governor's office. By 1845, the Whigs controlled both the legislature and the governor's office once again. That year, the legislature enacted the Kelley Bank Bill, establishing the State Bank of Ohio. Unfortunately for Ohio Whigs, the turmoil that their party faced on the national level in the late 1840s and the early 1850s also influenced state politics. As the Whig Party collapsed nationally, Ohio Whigs associated themselves with other parties, primarily the Free Soil Party, the Know-Nothing Party, and eventually the Republican Party.