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.

Entrepreneurs lived in these cities and started businesses there.

Explanation:

Before the massive industrial development in the United States' interior, all major jobs were related to port cities. These are the places where the first colonies were founded, so this is the reason why they developed rapidly. The lack of railway infrastructure in the country's interior is the reason why port cities have developed rapidly. The ports were the center of trade and business, so it was in these places that the first industrial capacities were developed. The companies' owners established their companies near the port because all the necessary raw materials arrived by the ships.