"South Dakota has often been referred to as "the land of infinite variety." That variety is reflected in everything from our weather and scenery to our economy, state symbols, and famous folks. South Dakota ranks 16th in size among the 50 states. It was the 40th state to join the Union in 1889 and encompasses 77,123 square miles, averaging 10 people per square mile. South Dakota boasts more miles of shoreline than the state of Florida and the highest point in the United States east of the Rocky Mountains "- Travel South Dakota.