1. On April 15, 1880, the first issue of the Mitchell Daily Republican newspaper was published in South Dakota. The newspaper, later known as The Daily Republic, is still in publication today.

2. On April 15, 1912, South Dakota native James Clinch Smith Jr. was one of the passengers aboard the ill-fated Titanic. Smith, who had been living and working in England, did not survive the disaster.

3. April 15, 1930, was the date of a major dust storm that swept across South Dakota and other states in the Great Plains. Known as Black Sunday, the storm caused widespread damage to crops and livestock, and reminded farmers of the challenges of life on the prairie.

4. On April 15, 1989, South Dakota Governor George Mickelson declared a State of Emergency due to record snowfall and flooding. The emergency declaration allowed the state to mobilize all available resources to respond to the disaster, which caused significant damage to property and infrastructure.

5. April 15, 2013, was the date of the Boston Marathon bombing. Despite being nearly 2,000 miles away from South Dakota, the attack had a profound impact on the state's residents, many of whom had connections to Boston or the marathon itself. Many South Dakotans expressed their support for the victims and their families in the aftermath of the tragedy.