1. On June 23, 1861, the first Confederate Civil War fortification in Tennessee was constructed in Clarksville. The fort, called Fort Defiance, was built to guard the Cumberland River.

2. The famous country musician and songwriter, Alan Jackson, was born on June 23, 1958, in Newnan, Georgia. Jackson has sold over 80 million records worldwide and is known for hits such as "Chattahoochee" and "Where Were You (When the World Stopped Turning)."

3. On June 23, 1972, the Clean Water Act was signed into law by President Richard Nixon. The act established regulations to protect and improve the quality of water in the United States, including Tennessee's many rivers and lakes.

4. The Battle of Hoover's Gap, a significant engagement in the Tullahoma Campaign of the Civil War, took place on June 23, 1863. Union forces, led by General George H. Thomas, defeated the Confederate army in a crucial battle that helped pave the way for the Union's eventual victory.

5. On June 23, 2015, Governor Bill Haslam signed a bill declaring the Tennessee Walking Horse as the official state horse of Tennessee. The breed, known for its distinctive gait and calm temperament, has a long history in Tennessee and is an important part of the state's cultural heritage.