Question

Which best describes why industry existed in the larger American port cities before industrialization?

The railroad linked these cities to the rest of the country.
The industry was established by the British military in the colonial period.
These cities were built on rivers and harbors and had plenty of workers.
Entrepreneurs lived in these cities and started businesses there.

Answer 1

These cities were built on rivers and harbors and had plenty of workers.

Ports gave easy access to raw materials, markets, and shipping, and concentrated populations provided labor and demand—so industry naturally developed there before railroads and full industrialization.