1. In 1868, the Iowa State Agricultural Society held its first meeting in Des Moines on March 30. The organization aimed to promote agriculture and the mechanization of farming across the state of Iowa.

2. On March 30, 1905, a severe hailstorm hit the town of Villisca, Iowa, causing significant damage to crops and property. The hailstones were reported to be the size of golf balls and caused windows to shatter and roofs to collapse.

3. Iowa Governor Tom Vilsack signed a bill on March 30, 2004, making Iowa the first state to require the use of biodiesel in all diesel fuel sold in the state. The move aimed to promote the use of renewable fuels and reduce emissions.

4. In 1912, John Henry Gear, a Republican politician from Iowa, died on March 30. Gear had served as a member of the US House of Representatives and was instrumental in the creation of the US Department of Agriculture.

5. The Iowa State Capitol building was dedicated on March 30, 1884, after several years of construction. The building's construction had been delayed due to a fire that destroyed the original building plans and a shortage of funds. The Capitol building remains an iconic landmark in Des Moines today.