Final answer:
The manufacturing cities in the United States are most heavily concentrated in the Northeast to Midwest region, also known as the Manufacturing Belt or Rust Belt. This region has a historic legacy of factories and industries due to its access to labor, raw materials, and markets.
Step-by-step explanation:
The manufacturing cities in the United States are most heavily concentrated in the Northeast to Midwest region. This region is also known as the Manufacturing Belt or Rust Belt, and it includes states in the northeastern parts of the United States and the Midwest. The concentration of factories and industries in this region is due to the availability of labor, access to raw materials, and proximity to markets.
For example, the steel industry was located in Pittsburgh because of its access to raw materials like iron ore from Minnesota and coal from Pennsylvania. The decline of manufacturing in this region was influenced by factors such as the rise of labor unions, cheaper labor in other areas or countries, and changes in economic trends.