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The IndyCar Series, officially known as the NTT IndyCar Series for sponsorship reasons, is the highest class of American open-wheel car racing in the United States, which has been conducted under the auspices of various sanctioning bodies since 1920. The series is self-sanctioned by its parent company, IndyCar, LLC, which began in 1996 as the Indy Racing League (IRL) and was created by then Indianapolis Motor Speedway

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