1. In 1961, the town of Tulsa celebrated its 75th anniversary. As part of the festivities, a time capsule was buried on July 21st at the site of the original Tulsa city hall.

2. On July 21, 1936, the Dust Bowl reached its peak in Oklahoma. Severe drought and high winds caused massive dust storms that devastated crops and forced many farmers to abandon their land.

3. In 1948, Linus Pauling, a Nobel Prize-winning chemist and peace activist, visited Oklahoma City and gave a lecture about the dangers of nuclear weapons. His speech was met with both applause and controversy.

4. July 21, 1908, marked the opening of the first Oklahoma state fair. The event drew more than 60,000 visitors and showcased the state's agricultural and industrial achievements.

5. On this day in 1941, Oklahoma Governor Leon C. Phillips signed the state's first minimum wage law, which set the minimum hourly rate for workers at 25 cents. The law was later superseded by federal minimum wage laws.