General Motors Co. was created on Sept. 16, 1908, by William C. Durant, a former buggy maker and owner of Buick Motor Co. in Flint, Mich., who realized that an auto manufacturer with only one car line stood little chance of long-term survival. Within 18 months, Mr. Durant had brought together about 25 carmakers and suppliers under the GM umbrella, including Olds Motor Vehicle Co.; Oakland Motor Car Co., which was renamed Pontiac Motor Co. in 1932; Cadillac Motor Car Co.; and Rapid Motor Vehicle Co., a truck manufacturer that helped form the GMC Truck division.