Final answer:
The subject of this question is History.
Step-by-step explanation:
In the context of the question, the subject being referred to is History. This is because the question is discussing societal and class dynamics in relation to industrialization and urbanization, which are historical phenomena. The features described in the question, such as middle or lower class, private sphere of home and community, focus on moral not social superiority, and the ability to improve one's situation in the social order, all reflect the historical context of the topic.