1. Integration of Alabama public schools: On September 15, 1963, four young girls were killed in the 16th Street Baptist Church bombing in Birmingham, Alabama. This event sparked a movement for racial equality and the integration of Alabama public schools.

2. Alabama Constitution Day: September 15 is also known as Alabama Constitution Day, as the state's first constitution was adopted on this day in 1819. This document established the state's fundamental laws and principles.

3. Tuskegee Airmen: In 1941, the first class of the Tuskegee Airmen, an African American unit of pilots and mechanics, began training at Tuskegee Army Air Field in Alabama. This group would go on to make significant contributions during World War II.

4. Hank Williams' last concert: Country music legend Hank Williams played his last concert in Montgomery, Alabama on September 15, 1952, just days before his death.

5. Alabama Crimson Tide Football: The University of Alabama's Crimson Tide football team played their first game of the 1900 season on September 15, defeating Birmingham High School 18-0. The team has since become one of the most successful programs in college football history.