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By the middle 1960s, road racing in America had enjoyed steady growth; spreading from Watkins Glen and Elkhart Lake in the late ’40s, to tracks all across the American landscape. Some tracks, like Florida’s Sebring circuit, was nothing more than a converted Army Air Corps training field for America’s aviators during the Second World War. Other tracks, like California’s Riverside Raceway, were purpose built to embrace America’s new found affection for a form of motor sport that was inherently…