Answer:
The correct answers are factory owners and the middle class.
Step-by-step explanation:
In the late 1800s, prosperity began with factories all over the countryside and most of the people who started being prosperous were especially the factory owners and the middle class. And the immigrants came to the country without anything so they needed to work in those factories to get the most basic to live. And the slum dwellers also worked in those for factories for their basic needs.