1. On September 20, 1863, the Battle of Chickamauga began in northwestern Georgia, just south of the Tennessee border. This was one of the largest and deadliest battles of the Civil War, with over 34,000 casualties. Union General William Rosecrans was defeated by Confederate General Braxton Bragg, delaying the Union's advance into Georgia.

2. The Cumberland Transit Company, one of the first bus companies in the United States, was founded in Nashville on September 20, 1894. Their first route connected Nashville to Murfreesboro, and they eventually expanded to other cities in Tennessee, Kentucky, and Alabama.

3. On September 20, 1920, Tennessee became the 36th and final state needed to ratify the 19th Amendment to the United States Constitution, granting women the right to vote. This achievement was largely due to the efforts of suffragists Carrie Chapman Catt and Anne Dallas Dudley, both of whom had strong ties to Tennessee.

4. The Grand Ole Opry, one of the longest-running radio broadcasts in the United States, debuted on September 20, 1925, on station WSM in Nashville. The show initially featured old-time fiddlers and string bands, but it soon became known for showcasing country music acts, including legends such as Roy Acuff, Hank Williams, and Patsy Cline.

5. On September 20, 1988, the American Eagle roller coaster opened at Six Flags Great America in Gurnee, Illinois. While this may not seem like a Tennessee-related fact, the coaster was designed by Arrow Dynamics, a now-defunct company based in Clearfield, Utah that had previously designed the Tennessee Tornado at Dollywood in Pigeon Forge. The American Eagle was one of the first wooden roller coasters to feature a "dueling" design, with two tracks racing side-by-side.