0
What decade are you living in?
GM owned Lotus briefly a long time ago. They sold it, and have since sold Hummer; killed Oldsmobile, Pontiac, and Geo; and destroyed Saab and Saturn.
Ford has sold off Jaguar, Land Rover, Volvo, and Aston Martin; and killed Mercury.
Chrysler sold Maserati, divorced Mercedes-Benz, killed Plymouth, bought AMC and killed everything from it except Jeep, created Ram and R/T, and married FIAT.
International Harvester quit making road vehicles.
Checker went out of business.
That should get you more-or-less up to date on the last 40 years of American car manufacturer history.
PhilB