IndyCar Series - Wikipedia
en.wikipedia.org › wiki › IndyCar_SeriesThe IndyCar Series, currently known as the NTT IndyCar Series under sponsorship, is the highest class of regional North American open-wheel racing in the United States, which has been conducted under the auspices of various sanctioning bodies since 1920 after two initial attempts in 1905 and 1916.
IndyCar - Wikipedia
https://en.wikipedia.org/wiki/IndyCarINDYCAR, LLC, is an American-based auto racing sanctioning body for Indy car racing and other disciplines of open wheel car racing. The organization sanctions two racing series: the premier IndyCar Series with the Indianapolis 500 as its centerpiece, and the developmental series Indy NXT. IndyCar is recognized as a member organization of the FIA through ACCUS.