1. On February 5, 1863, the Union army led by General William Rosecrans defeated the Confederate army at the Battle of Murfreesboro. This pivotal victory boosted Union morale and helped secure control of middle Tennessee.

2. February 5, 1934, is known as "Black Tuesday" in Tennessee, as the state experienced a devastating flood that killed 23 people and caused millions of dollars in damages. The flooding was caused by heavy rains and overflowing rivers, and forced thousands of people from their homes.

3. Tennessee governor Clement Vallandigham signed the state's first income tax law on February 5, 1923. The law, which established a tax on individual income and corporate profits, was intended to provide a stable source of revenue for the state.

4. On February 5, 1952, Tennessee native John Ford won his fourth Academy Award for Best Director for the film "The Quiet Man." Ford is considered one of the greatest filmmakers in history and is often credited with helping to define the Western genre.

5. February 5, 1973, marked the opening of the Tennessee Aquarium in Chattanooga. The aquarium is now one of Tennessee's top tourist attractions, featuring over 12,000 animals and more than 300 species. It is also home to the world's largest freshwater aquarium, the River Journey exhibit.