Chevrolet is a brand produced by General Motors. It is the top selling GM marque, with "Chevrolet" or "Chevy" being at times synonymous with GM. Chevrolet offers 18 vehicles and many different enhanced versions in its home market. The vehicles range from subcompact cars to medium duty commercial trucks. Its number one seller in the United States is the Silverado pickup. Chevrolet continues to be the performance, price, fuel economy, and value leader for General Motors North America.
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Cadillac is a luxury vehicle marque owned by General Motors. Cadillac vehicles are sold in over 50 countries and territories, but mainly in North America.
Founded in 1902 as the Cadillac Automobile Company, it was purchased in 1909 by General Motors and over the next thirty years established itself as America's premier luxury car. Cadillac pioneered many accessories in automobiles, including full electrical systems, the clashless manual transmission, and the steel roof. The brand developed three engines, one of which (the V8) set the standard for the American automotive industry.
Excerpted from Wikipedia.org