American open-wheel car racing

The national championship was sanctioned by the Contest Board of the American Automobile Association (AAA). The AAA first sanctioned automobile motorsports events in 1902. At first it used the rules of the Automobile Club of America (ACA), but it formed its own rules in 1903. It introduced the first track season championship for racing cars in 1905. Barney Oldfield was the first champion. No official season championship was recognized from 1906 to 1915, however, many races were held. Official records regard 1916 as the next contested championship season.[1][2] Years later, retroactive titles were named back to 1902.[3][4] These post factum seasons (1902–1904, 1906–1915, and 1917–1919) are considered unofficial and revisionist history by accredited historians.

Racing did not cease in the United States during WWI, but the official national championship was suspended. The Indianapolis 500 itself was voluntarily suspended for 1917–1918 due to the war. In 1920, the championship officially resumed, and despite the difficult economic climate that would later follow, ran continuously throughout the Depression. Shortly after Pearl Harbor, all auto racing was suspended during World War II. From 1942 to 1945 no events were contested, banned by the U.S. government primarily on account of rationing. Racing resumed in full in 1946. The 1946 season is unique, in that it included six Champ Car events, and 71 "Big Car" races, as organizers were initially unsure about the availability of cars and participation.

AAA ceased participation in auto racing at the end of the 1955 season. It cited a series of high-profile fatal accidents, namely Bill Vukovich at Indianapolis, and the Le Mans disaster.[5]

Through 1922 and again from 1930 to 1937, it was commonplace for the cars to be two-seaters, as opposed to the aforementioned standard single-seat form. The driver would be accompanied by a riding mechanic (or "mechanician").

The national championship was taken over by the United States Auto Club (USAC), a new sanctioning body formed by the then-owner of the Indianapolis Motor Speedway, Tony Hulman. Championship racing continued to grow in popularity in a stabilized environment for over two decades, with the two traditional disciplines of paved oval tracks and dirt oval tracks. During the 1950s, front-engined "roadsters" became the dominant cars on the paved oval tracks, while "upright" Champ Dirt Cars continued to dominate on dirt tracks. In the 1960s, drivers and team owners with road racing backgrounds, both American and foreign, began creeping into the series and the paved oval track cars evolved from front-engine "roadsters" to rear-engine formula-style racers. Technology, speed, and expense climbed at a rapid rate. The schedule continued to be dominated by oval tracks, but a few road course races were added to assuage the newcomers. Dirt tracks were dropped from the national championship after 1970.

During the 1970s, the increasing costs began to drive some of the traditional USAC car owners out of the sport. The dominant teams became Penske, Patrick, Gurney, and McLaren, all run by people with road racing backgrounds. There was a growing dissent between these teams and USAC management. Events outside Indianapolis were suffering from low attendance, and poor promotion. The Indy 500 was televised on a same day tape delayed basis on ABC, however, most of the other races had little or no coverage on television.

Towards the end of the decade, the growing dissent prompted several car owners to consider creating a new sanctioning body to conduct the races. Meanwhile, two events had a concomitant effect on the situation. Tony Hulman, president of the Indianapolis Motor Speedway and founder of USAC, died in the fall of 1977. A few months later, eight key USAC officials were killed in a plane crash. By the end of 1978, the owners had broken away and founded Championship Auto Racing Teams (CART) to wrest control of Championship racing away from USAC.

Championship Auto Racing Teams (CART) was formed by most of the existing team owners, with some initial assistance from the SCCA (in order to be recognized by ACCUS). Therefore, there were two national championships run each by USAC and CART. The Indianapolis 500 remained under USAC sanction. The top teams allied to CART, and the CART championship quickly became the more prestigious national championship. USAC ran a "rump" 1979 season, with few name drivers — the only exception being A. J. Foyt. In 1979, USAC denied several of the entries from the CART teams at the 1979 Indianapolis 500. The controversy saw a court injunction during the month, which allowed the CART-affiliated entrants to participate.

In 1980 USAC and CART jointly formed the Championship Racing League (CRL) to jointly run the national championship, but IMS management disliked the idea. USAC pulled out of the CRL arrangement in July.[6] CART continued with the schedule for the remainder of the season.[7] Both CART and USAC awarded separate national championship titles that year, and Johnny Rutherford happened to win both.

In 1981–1982, the Indianapolis 500 remained sanctioned by USAC. The preeminent national championship was now the one being sanctioned by CART. The Indy 500 field would consist largely of CART teams, as well as numerous independent, "Indy-only" teams. Indianapolis was not included as a points-paying round of the CART national championship. In addition, by that time USAC had designated Indianapolis an "invitational" race, offering entries only to invited teams.[8][9][10] That moved in part to prevent the uproar over denied entries which occurred in 1979. One further race in 1981 was run by USAC at Pocono. This race was not supported by many CART teams, and featured a mixed field filled out by converted dirt track cars. USAC soon stopped sanctioning championship races outside the Indianapolis 500.

Stability returned and the national championship was now run by CART full-time. The Indianapolis 500 was sanctioned singly by USAC, but points were paid towards the CART season championship. The cars and engines used in the CART races and USAC-sanctioned Indy 500 were the same, with only relatively minor rules differences. The Indy 500 field would consist of the CART regulars, and numerous one-off ("Indy only") entries. On occasion, some of the "Indy only" entries also elected to participate in the Michigan 500 and Pocono 500 (both sanctioned by CART) given the increased stature and exposure of those two events.

One of the more noticeable rule differences by USAC was allowing "stock block" engines a higher level of turbocharger boost. While most full-time CART-based teams utilized their V-8 quadcam engines at Indy, some of the smaller or "Indy only" teams elected to run stock block engines, attracted by the boost rules.

USAC's Gold Crown Championship continued, settling into an unusual June through May schedule calendar. This provided that the Indianapolis 500 would be the final race of the respective season. However, during that period, the USAC Gold Crown schedule never included more than one race (i.e., Indianapolis). As such, the winner of the Indy 500 would automatically win the USAC Gold Crown Championship.

In 1994, Tony Hulman's grandson, Tony George, president of the Indianapolis Motor Speedway, founded the Indy Racing League (IRL), to begin competition in 1996. It would exist as a separate championship, and leveraged the fame of the Indianapolis 500, which was placed as its centerpiece. After the IRL announced that 25 teams that competed in IRL races would get automatic qualifications to the race, making it impossible for the majority of the CART field to make the race, CART teams boycotted the 1996 Indy 500. It was the beginning of the second open-wheel "split". Initially, USAC sanctioned the IRL, however after officiating controversies in 1997 at Indianapolis and Texas, the USAC was replaced by the IRL's in-house officiating.

CART, which had been licensing the trademarked "IndyCar" name for several seasons, subsequently entered into a legal battle with the Indianapolis Motor Speedway (the trademark owner) over the use of the moniker. Eventually a settlement was reached in which CART gave up use of the name, but the IRL in turn could not use it until 2003. CART rebranded themselves with the CART name, and began referring to their machines as Champ Cars.

CART's existing national championship remained dominant after the split for some time, initially retaining the top drivers, teams, and sponsors. However, in 2000, CART teams began to return to the Indy 500, eventually defecting permanently to the IRL. For 2003, it lost title sponsor FedEx and engine providers Honda and Toyota to the IRL.

After steadily losing teams and drivers, sponsors, and manufacturers, and after a series of major financial setbacks, CART filed for bankruptcy in 2003. The assets were purchased by a consortium called Open Wheel Racing Series (OWRS) in 2004 and the series was renamed the Champ Car Open Wheel Racing Series, later renaming it to the Champ Car World Series. However, the sanctioning body continued to be plagued by financial difficulties, In 2007, CCWS's presenting sponsors Bridgestone and Ford Motor Company withdrew.

During this time, the IRL was now operating under the moniker IndyCar Series, and slowly beginning to establish itself as the more preeminent national championship trail. In 2005, the IRL added road/street courses, and began picking up several former CART venues.

2019 Indianapolis 500, an IndyCar sanctioned race

Prior to the start of the 2008 season, the CCWS Board authorized bankruptcy and Champ Car was absorbed into the IRL, creating a unified series for the national championship for the first time since 1978. The unified series competed under the name IndyCar Series. The two calendars were merged into one schedule, with the top Champ Car races surviving. Some of the other races from the Champ Car schedule were dropped or put on hiatus for a few seasons. All historical record and property of CART/CCWS was assumed by the IRL.

Randy Bernard was announced as the new IRL CEO in February 2010.[11] In 2011, the sanctioning body dropped the Indy Racing League name, becoming IndyCar to reflect the merged series. The new Dallara DW12 racecar was introduced for the 2012 season. Bernard was replaced by Mark Miles in 2012. The series operated under the name IZOD IndyCar Series from 2010 to 2013, then became known as the Verizon IndyCar Series from 2014 to 2018, and the NTT IndyCar Series since 2019.

In 2020, the IndyCar Series, as well as the Indianapolis Motor Speedway and other holdings, was sold to Penske Entertainment Corp., a subsidiary of the Penske Corporation, owned by Roger Penske[12]

• "Indy car" is a generic name for championship open-wheel auto racing in the United States. "Indy car" initially described an open-wheel car that participated in the Indianapolis 500-Mile Race. Originally, the cars were generally referred to as "Championship cars". However, as the result of the Indianapolis being the most notable race on the calendar, many people started to apply the "Indy car" designation for the entire American open-wheel class of cars in order to differentiate those from other types of open-wheel cars, such as those used in Formula One.
• In general, IndyCars of both CART and IndyCar are slower on street and road courses, being less expensive and technology-centric platforms than their Formula One counterparts. This was even the case during the CART PPG era during the mid to late 1990s. Currently, with the bid to keep costs down around teams, a competitive Indy car team like Newman/Haas Racing operates on approximately US$20 Million per season, while the McLaren-Mercedes F1 team has an annual budget of US$400 million.[13]
• The Formula One chassis was required to be built by their respective team/constructor since 1981, whereas an Indy car chassis could be purchased. The dominance of a select few manufacturers has essentially turned the IndyCar Series into a spec series. CART/CCWS became a spec series more intentionally for cost savings purposes.

• Indy car racing historically tended to take place on high speed ovals, while Formula One used primarily permanent road courses. Recently, however, Champ Car had no oval tracks for the 2007 season which was its last, while the IRL added street courses to what was originally an all-oval series, and IndyCar has had a nearly equal balance of ovals and non-ovals in some years. Currently, however, IndyCar has fewer ovals on its schedule than non-ovals.
• Indy car racing was dominated by North American drivers until the 1990s, which saw incursions from European and South American drivers. This led to Tony George forming the IRL in order to promote American drivers. Conversely, American drivers have never found great success in Formula One since the 1970s; the last American drivers' champion and race winner was Mario Andretti (who was born in Europe).
• Due partly to the lack of American drivers, Formula One has struggled to establish itself in that market, at certain years not having a United States Grand Prix on the calendar (before the return of F1 to the United States in 2012, the most recent stint was from 2000 to 2007). In a parallel, CART/CCWS/IRL has made little headway outside the United States and Canada, even though it regularly has a handful of tracks around the world.

For the majority of the national championship, the races have been held inside the United States. American championship cars raced at the Monza oval in 1957 and 1958 alongside Formula One and sports cars in the non-championship Race of Two Worlds.[14] Also, in 1966 there was a non-championship USAC race at Fuji Speedway in Japan. The first championship events outside the U.S. took place in 1967 at Mosport and Saint-Jovite in Canada. In 1971, the USAC season-opening race was held at Rafaela. In the autumn of 1978, two races were held in England, the first at Silverstone, then a week later at Brands Hatch.

Beginning in the mid-1980s, CART expanded throughout North America, venturing into Mexico (Mexico City) and Canada (Sanair, Toronto and Vancouver). In the 1990s and early 2000s, international expansion reached overseas with events at Surfer's Paradise, Rio de Janeiro, Motegi, Lausitz, and Rockingham.

Towards the end of its run, Champ Car ran races at European tracks such as TT Circuit Assen and Zolder Circuit, intentionally scheduled in regions and dates that would not compete with Formula One.

In 2011 IndyCar revived the Astor Cup, first awarded in 1915 as the series championship trophy. A black granite base has been added displaying the names of all the American Championship car racing series winners since 1909.

The 1916, 1936 and 1937 Vanderbilt Cup races were included in the national championship. The 1909–1915 races were retrospectively added to the championship in 1926. CART resurrected the Cup in 1996 as the winner's trophy for the US500 race. When that race was discontinued in 2000, the Cup changed roles and became the championship trophy. Champ Car retained the rights to use the trophy after CART's bankruptcy, but use of the trophy was discontinued after Champ Car's merger with the Indy Racing League.