Historically, open wheel racing was the most popular form of U.S. motorsport nationwide. However, an acrimonious split (often referred to by many as "The Split") in 1994 between the primary series, CART (later known as Champ Car), and the owner of the Indianapolis Motor Speedway (the site of the Indy 500), Tony George, led to the formation of the Indy Racing League, now known as INDYCAR, which launched the rival IndyCar Series in 1996. From that point on, the popularity of open wheel racing in the U.S. declined dramatically. The feud was settled in 2008 with an agreement to merge the two series under the IndyCar banner, but enormous damage had already been done to the sport. Post-merger, IndyCar continues to run with slight viewership gains per year. However, as a result, the only post-Split IndyCar race that still enjoys widespread popularity among the general public is the Indianapolis 500.