Where were factories built in the noetheast throughout the 1800s?

In the Northeast during the 1800s, factories were primarily built in urban areas along rivers and waterways, which provided the necessary water power for machinery. Key cities such as Lowell, Massachusetts, and Pawtucket, Rhode Island, emerged as industrial centers, leveraging their access to transportation networks and labor. The region's infrastructure, including railroads and canals, further facilitated the growth of factories, particularly in textiles and other manufacturing sectors. This industrial expansion marked a significant shift from agrarian economies to urban industrialization.