Henry Martin Leland, the founder of Cadillac, is a manufacturer in New England. He attaches great importance to the machining accuracy, manufacturing quality and interchangeability of parts, which is the key to rapidly increase production and expand the scale of automobile development. Under the guidance of this very novel concept at that time, by 1906, Cadillac's factory in Detroit had become the largest, most complete and best-equipped automobile factory in the world at that time, and the cars produced were also the best. Cadillac 1909 joined GM. Since then, Cadillac has paid more attention to luxury and comfort when designing cars. Up to now, Cadillac still maintains this tradition and is famous for producing luxury cars.