1. On June 27, 1918, the United States government established Badlands National Monument in South Dakota. The park is famous for its unique terrain, which includes steep canyons, spires, and towering pinnacles.

2. In 1983, the annual Sturgis Motorcycle Rally began on June 27, drawing thousands of bikers to the small town in the Black Hills of South Dakota. The rally has since become one of the largest motorcycle events in the world, attracting more than 500,000 visitors each year.

3. On June 27, 1892, South Dakota State University was founded in Brookings. Today, the university is the state's largest institution of higher education and is ranked among the top 200 public universities in the nation.

4. In 1905, the first Sioux Falls Air Show was held on June 27, featuring hot air balloons, stunt planes, and aerial acrobatics. The event has since become an annual tradition in the city, drawing aviation enthusiasts from around the region.

5. On June 27, 1877, the Great Dakota Boom began when gold was discovered in the Black Hills. The discovery led to a rush of prospectors and settlers to the region, sparking a decade of unprecedented growth and development in South Dakota.