1. Iowa became a state on March 3, 1845. This day is significant in Iowa history because it marks the official beginning of its statehood. Iowa's statehood was approved by the US Congress on December 28, 1846, and it officially became a state on August 6, 1846.

2. The Iowa Peace Institute was founded on March 14, 1904. This organization was founded by Iowa activists who were concerned about the growing militarism in the world. The institute aimed to promote peace and international cooperation through education and advocacy.

3. The Iowa State Capitol building was completed on March 14, 1886. The building is located in Des Moines and is the seat of government for the state of Iowa. Its construction took six years and cost $2.7 million, which is equivalent to $80 million today.

4. On March 14, 1985, Iowa native Peggy Whitson became the first woman astronaut to participate in a spacewalk. Whitson grew up on a farm in Beaconsfield, Iowa, and went on to become a NASA astronaut. She has spent a total of 665 days in space, more than any other American astronaut.

5. On March 14, 2019, Iowa Governor Kim Reynolds signed a bill allowing sports betting in the state. This made Iowa the 11th state to legalize sports betting since the repeal of a federal ban in 2018. The law allows for in-person and online sports betting, and it is overseen by the Iowa Racing and Gaming Commission.