1. In 1920, Tennessee became the 36th state to ratify the 19th Amendment, granting women the right to vote. This historic moment took place on August 18th, and Tennessee would go on to be known as the "Perfect 36" for its crucial role in securing women's suffrage.

2. On August 18, 1925, Thomas B. Kite launched the first-ever airmail service in Tennessee. The service connected Chattanooga and Nashville, and it paved the way for later developments in aviation and communication throughout the state.

3. In 1937, Tennessee experienced a devastating flood that killed 51 people and caused extensive damage throughout the state. The flood occurred between August 12th and August 23rd, and August 18th was one of the worst days of the disaster.

4. On August 18, 1956, Elvis Presley played a concert at Russwood Park in Memphis that marked a turning point in his career. The concert was his first performance in Memphis since becoming a national sensation, and it helped solidify his status as the "King of Rock and Roll."

5. August 18, 1987, marked the opening of the Tennessee Aquarium in Chattanooga. The aquarium quickly became a beloved attraction, featuring exhibits on freshwater and saltwater animals, as well as many educational and interactive experiences for visitors of all ages. Today, the Tennessee Aquarium is one of the most popular tourist destinations in the state.