1. In 1795, the Treaty of Greenville was signed between the United States of America and several Native American tribes, including the Wyandot, Delaware, Shawnee, and Miami. The treaty allowed for the sale of land in Ohio and established a boundary between U.S. and Native American lands.

2. In 1903, the Dayton Wright Company was founded by Orville and Wilbur Wright, along with several business partners. The company produced aircraft and aviation engines, and played a significant role in the development of the aviation industry in Ohio and the United States.

3. In 1916, the Cleveland Museum of Art was officially dedicated in University Circle. The museum, which houses over 60,000 works of art, is one of the largest and most comprehensive art museums in the United States.

4. In 1953, the first polio vaccine developed by Dr. Jonas Salk was administered to patients in Cleveland. Polio was a serious disease that had caused outbreaks in the United States for decades, but the development of the vaccine helped to drastically reduce the number of cases.

5. In 2005, Ohio State University quarterback Troy Smith was named the winner of the Heisman Trophy, college football's most prestigious award. Smith, who had led the Buckeyes to an undefeated season and a berth in the national championship game, was the first Ohio State player to win the award since 1975.