What are the traditional industrial sectors in the United States? etc

The traditional industrial sectors in the United States mainly include: iron and steel industry, coal industry, chemical industry and so on. (There are also machinery industry and power industry). Representative cities include Detroit, Pittsburgh, Chicago, etc. The high-tech industrial sectors in the United States mainly include: information technology, aerospace, new material technology, etc. (In fact, there are biotechnology, new energy, earth science and ocean engineering technology, photoelectric science and photoelectric integration, etc. ), the representative cities are San Francisco, Houston and Seattle.