1. In 1836, Arkansas was admitted as the 25th state to join the United States of America. This historic event happened on May 15th and was an important milestone for the state.

2. On May 15th, 1862, Union troops under General Samuel Curtis defeated Confederate forces at the Battle of Sylamore Creek in Stone County, Arkansas. This was one of several significant engagements in the state during the Civil War.

3. In 1926, the Arkansas State Capitol building was dedicated in Little Rock. The building had been under construction for several years and was completed at a cost of over $2.2 million. The dedication ceremony took place on May 15th and was attended by many prominent political and civic leaders.

4. On May 15th, 1959, the first of many tornadoes hit the state of Arkansas. This particular tornado touched down in Saline County and caused significant damage in the area. Over the years, Arkansas has been hit by numerous tornadoes, many of which have caused significant destruction and loss of life.

5. In 1970, the Arkansas Razorbacks won their first NCAA men's track and field championship. The team, coached by John McDonnell, went on to win an unprecedented 40 national championships in the sport over the next four decades. The championships were held in Des Moines, Iowa and took place on May 15th.