Final answer:
Textile mills in the 1840s were built near the source of raw materials and cities along the Atlantic coast.
Step-by-step explanation:
The subject of this question is History. The question is asking about the location of textile mills in the 1840s. Entrepreneurs built textile mills near the source of their raw materials, which were typically located near cities along the Atlantic coast. This allowed them to have access to both the raw materials and a workforce.