Fun fact: technically Ohio did not become a state until 1953. It seems that when the Buckeye State was planning its 150th anniversary celebration, someone tried to look up the paperwork and found that a state charter was never filed. There's some confusion as to why or if Ohio really needed one at the time. (Ohio was the first state created out of a territory, which led to most of the confusion; Vermont, Tennessee and Kentucky already had governments in place before they applied for statehood.) Just to be thorough, however, an Ohio congressman in 1953, George Bender, introduced a bill in Congress to declare Ohio a state. It was quickly passed and signed into law by President Eisenhower. You can read all of the details about the situation on The Green Papers.com.