Lincolns are Fords in tuxedos. The Town Car is a Grand Marquis is a Crown Victoria. The Navigator is an Expedition. Etc. This has been true for many decades. The Continental of the sixties shared a frame and powertrain with the Ford Galaxy. Cadillacs share platforms with other GM products as well, and have for a very long time. The XLR is a reskinned Corvette, the Escalades are either a Tahoe or an Avalanche. Sorry to break your bubble!
All major factories share platforms across brand names. Most Lexus models are Toyotas, Audi and Volkswagen share platforms, Infinity models are Nissans. Except for the original H1, Hummers are Chevies (the H2 is a Tahoe, and the H3 is a Canyon). Porsche, BMW and Mercedes do very little platform sharing, but they do share engines and transmissions and other major components. Chrysler's 300C uses a Mercedes transmission, as an example. Even Jaguar bases most of its cars on Ford platforms! And, of course, Buick, Chevrolet, Pontiac and Saturn are all the same under the sheetmetal. Mitsubishi, Hyundai and Kia all share parts and engineering. Most Acura models began as Hondas.
It is not economical to develop a competitive, emissions legal and safety certified vehicle and produce it in small numbers, unless it's a very expensive car. A new vehicle often represents several billion dollars in design and development. Hundreds of thousands or even millions of cars need to be sold to pay back this investment.
The "world engine" used in the Dodge Caliber and Jeep Patriot is also used by Hyundai, Mitsubishi and Mercedes. The engine plant was a three and a half billion dollar investment, and needs to produce several hundred thousand engines a year to be economical. Until the Liberty became a Dodge Nitro, Jeep was the only domestic brand that did not share platforms, and the Wrangler and Grand Cherokee are still unique. The Patriot and Compass are repurposed Calibers, however.
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