1. In 1895, the Arkansas State Capitol building was formally dedicated with a ceremony attended by thousands of people. Designed by architect George R. Mann, the Capitol is one of the most recognizable landmarks in Arkansas and serves as the center of state government to this day.

2. On October 21, 1944, the USS Arkansas became the first US Navy ship to be equipped with radar-controlled anti-aircraft guns. This new technology significantly improved the ship's ability to defend against Japanese kamikaze attacks during World War II.

3. The University of Arkansas's Razorback Stadium was officially dedicated on October 21, 1939, with a game against Oklahoma A&M. The stadium, which has undergone numerous renovations over the years, remains a popular destination for Razorback fans and hosts many major sporting events.

4. Country music legend Johnny Cash was born in Kingsland, Arkansas, on October 21, 1932. Despite facing numerous personal and professional challenges over the course of his career, Cash remained a beloved icon of the genre until his death in 2003.

5. On October 21, 1975, Arkansas Governor David Pryor signed a bill establishing the Arkansas Highway Police, a specialized law enforcement agency tasked with overseeing the state's highways and enforcing various transportation-related laws. Today, the agency is responsible for a wide range of duties, including ensuring the safe transport of hazardous materials and investigating traffic accidents.