Incorporated January 10, 1851, the city was known in the early 20th century as the home to Major League Baseball spring training, illegal gambling, speakeasies during the Prohibition era, and gangsters such as Al Capone, horse racing at Oaklawn Park, the Army and Navy Hospital, and 42nd President Bill Clinton. The area was established as a national park on March 4, 1921. Until the redesignation of Jefferson National Expansion Memorial as Gateway Arch National Park in 2018, Hot Springs was the smallest national park by area in the United States. Since Hot Springs National Park is the oldest park maintained by the National Park Service, it was the first to receive its own US quarter in April 2010 as part of the America the Beautiful Quarters coin series.