Two icons of the U.S. auto planet, Andretti World wide and Basic Motors Co.’s Cadillac, are teaming up to race in the world’s most prestigious, open-wheel, motor-racing sequence, Method 1. The bombshell information Thursday came as Formulation 1 and Cadillac are building significant pushes in new markets, and dovetails with retired race-car or truck driver Michael Andretti’s ambitions to abide by in the footsteps of his renowned father, Mario Andretti, to conquer F1 with an American staff. The shift also comes as GM is accelerating its determination to global motorsport: Cadillac is pursuing victory at the 24 Hours of Le Mans this yr with a new, prototype athletics car, and…