1. Georgia became a colony: On September 20, 1735, Georgia became a colony after King George II signed a charter allowing a series of trustees to establish a new colony in North America.

2. The birth of Andersonville Prison: September 20, 1864, marked the beginning of the most notorious military prison during the Civil War, Andersonville Prison, which was located in Sumter County, Georgia. The Confederate military held over 45,000 Union prisoners of war in inhumane conditions, leading to the deaths of nearly 13,000.

3. A famous Georgia artist was born: In 1929, the renowned Georgia artist Benny Andrews was born on September 20. He was known for his mixed media pieces and was one of the most important African American artists of his time.

4. The Flood of 2009: On September 20, 2009, Atlanta experienced a major flood due to several days of torrential rain. The flood caused significant damage to infrastructure and buildings throughout the city, with several people losing their lives.

5. Atlanta hosted the Summer Olympics: On September 20, 1996, the city of Atlanta hosted the closing ceremonies for the Summer Olympics held that year. The Games proved to be a success, with the USA obtaining more gold medals than any other participating country.