Original: In the USA, there is not as much FIA involvement; instead, many organizations regulate racing, such as the IKF (International Kart Federation), WKA (World Karting Association), KART (Karters of America Racing Triad).
Simplified: In the USA, many organizations regulate racing, such as the International Kart Federation (IKF), World Karting Association (WKA), Karters of America Racing Triad (KART), and Stars of Karting presented by the Indy Racing League.