1. On May 20, 1861, Tennessee became the last state to secede from the United States and join the Confederacy during the Civil War.

2. On May 20, 1905, the Tennessee Centennial and International Exposition opened in Nashville. The event celebrated the 100th anniversary of Tennessee statehood and showcased the state's culture, industry, and progress.

3. On May 20, 1927, aviator Charles Lindbergh made a historic stop in Memphis during his solo transatlantic flight. He landed at Memphis Municipal Airport and received a hero's welcome from the city.

4. On May 20, 1954, the U.S. Supreme Court handed down its landmark decision in Brown v. Board of Education, declaring that segregation in public schools was unconstitutional. The ruling had a significant impact on Tennessee's efforts to desegregate its schools.

5. On May 20, 2010, historic flooding devastated parts of Tennessee, including Nashville and its surrounding areas. The flooding caused billions of dollars in damage and resulted in 26 deaths across the state.