1. In 1896, the city of Aberdeen was incorporated in South Dakota. It is the third most populous city in the state after Sioux Falls and Rapid City. The city was named after Aberdeen, Scotland.

2. In 1907, Sioux Falls became the first city in the world to install a rock crusher on a city street to improve road conditions. The crusher was used to crush large rocks into smaller ones that could be used to fill in potholes on the street.

3. In 1946, the Belle Fourche Dam was completed in western South Dakota. It was built to control flooding along the Belle Fourche River and to provide irrigation water to farmers in the area. The dam is 225 feet high and 1900 feet long.

4. In 1974, the Custer State Park Resort Lodge caught fire and burned to the ground. The lodge had been built in 1920 and was a popular destination for tourists visiting the park. A new lodge was built on the same spot and opened in 1993.

5. In 1983, South Dakota Governor Bill Janklow signed a law making Mount Rushmore the official state icon. Mount Rushmore is a national memorial located in the Black Hills and features the faces of four US Presidents: George Washington, Thomas Jefferson, Abraham Lincoln, and Theodore Roosevelt.