General Motors presented La Salle in 1927. It was a luxury brand they established to fill the market gap between Cadillac and their more common brands like Buick or Oldsmobile. La Salle was under the control of Cadillac, so they developed it alongside. The concept was fairly successful, so the La Salle was a relatively popular model.
The big part of its appeal was the design and technology. Car buyers got a baseline Cadillac for less money, which appealed to a wider audience. However, by the end of the ‘40s, General Motors realized that having several brands covering the same market segment wasn’t practical, so they decided to kill the brand.