The correct answer is: "America changed to an urban society"
The agricultural sector that employed most people before the industrialization process, had become highly unproductive and it accumulated a surplus of workers. Meanwhile, the factory production system had emerged and attracted many of the former workers of the stagnated agricultural activities, and these people moved from the countryside to the cities, where the factories were located.
In general, "America
changed to an urban society" is a reason why the factory system developed in the United States. Another was a greater demand for textiles.
