1. On August 18, 1920, the 19th Amendment to the U.S. Constitution was ratified, granting women the right to vote in national elections. In Oklahoma, suffragists had been pushing for women's suffrage for years, with the state granting women the right to vote in primary elections in 1918.

2. On August 18, 1812, the Battle of Brownstown took place during the War of 1812. A group of American soldiers, led by General William Hull, engaged in a brief skirmish with a group of Native Americans near Brownstown, Michigan. Though the battle was a small one, it was an important moment in the conflict.

3. On August 18, 1967, a tornado struck the town of Oak Grove, Oklahoma, causing widespread damage and killing one person. The tornado was part of a series of storms that hit the area that summer, causing a number of deaths and millions of dollars in property damage.

4. On August 18, 1904, the first football game was played at Owen Field on the University of Oklahoma campus. The game was between the University of Oklahoma and the nearby town of Noble, and ended in a 75-0 victory for the home team.

5. On August 18, 1934, police officers in Tulsa, Oklahoma, engaged in a shootout with notorious gangsters Bonnie and Clyde. The shootout took place near a busy intersection in the city, with the police ultimately forcing the outlaws to flee. The incident made national headlines and further solidified the reputation of Bonnie and Clyde as America's most wanted criminals.