1. On April 12, 1937, the Sioux Falls Public Library was dedicated. It was designed by local architect Joseph Schwarz and features a large collection of books and a unique art collection.

2. In 1964, South Dakota became the first state to construct a uniform building code. The code was designed to improve safety and prevent fires and other hazards.

3. On April 12, 1889, the Dakota Territory officially became two separate states: North Dakota and South Dakota. President Benjamin Harrison signed the admission proclamation for both states on the same day.

4. In 2009, South Dakota celebrated the centennial of the first flight across the state. In 1909, Lincoln Beachey, a famous aviator, flew from Yankton to Chamberlain in just over an hour.

5. On April 12, 1912, the grand opening of the Hotel Alex Johnson took place in Rapid City. The hotel was named after Alex Johnson, a wealthy lumber baron who built the hotel in response to the growing demand for lodging during the Black Hills gold rush. Today, the hotel is a National Historic Landmark and a popular tourist destination.