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Sixty-four seasons of NASCAR, the highest class of stock carauto racing in the United States. The NASCAR championship season consists of a series of races held usually on purpose-built tracks. The results of each race are combined to determine two annual championships in each of the top series, one for drivers and one for manufacturer. The Drivers' Championship is awarded to the most successful NASCAR driver over a season, as determined by a points system based on race results, and has been awarded since the first NASCAR season in 1949. The Manufacturers' Championship is awarded to the most successful NASCAR manufacturer over a season, also determined by a points system based on race results. The Manufacturers' Championship was first awarded in 1952.