Industrialization restructured society profoundly: moving populations from rural to urban areas, replacing extended families with nuclear families, shifting labor to formal organizations, and creating new class structures based on capital rather than land ownership.
From your study of how societies evolve through different types — from hunter-gatherer bands to agricultural and then industrial societies — you already have the macro-level arc: industrialization represents one of history's most compressed and total social transformations. What makes industrialization sociologically remarkable is not the technology itself but what happens to every dimension of social organization when the primary site of production moves from farm and household to factory. Almost no institution remained unchanged.
The most visible change was urbanization. Industrial production required concentrating workers near factories and distribution networks, pulling populations off land that could now be farmed by fewer people with machines. Cities grew at rates that outpaced housing, sanitation, and governance — creating the social problems (overcrowding, poverty, crime, disease) that made sociology a discipline in the first place. Émile Durkheim and Karl Marx were both responding to the disorder of industrial cities. Your prerequisite on Weber's rationalization connects here: the factory was perhaps the first institution to systematically apply rationalization — breaking work into measurable, standardized, interchangeable tasks — to human labor on a mass scale.
The family was transformed as much as the city. In agrarian societies, the extended family was simultaneously an economic unit, a welfare system, a school, and a political entity; land, labor, and kinship were inseparable. Industrial wage labor severed these connections. Work moved outside the home; children became economic liabilities rather than assets (eventually triggering child labor laws and compulsory schooling); the elderly lost productive roles; and the household shrank to the nuclear family focused primarily on reproduction and emotional support. The modern distinction between "public" (work, politics, economy) and "private" (family, emotion, domesticity) is an artifact of industrialization, not a natural feature of human social organization.
Class structure also underwent a fundamental reorganization. Agrarian societies were organized around land — aristocrats owned it, peasants worked it. Industrial capitalism reorganized hierarchy around capital — the ownership of factories, machines, and investment. The bourgeoisie (owners of capital) and the proletariat (sellers of wage labor) became the defining class categories, replacing the older division between lords and serfs. This new class structure was theorized most systematically by Marx, who saw in the wage relationship the central contradiction that would eventually destabilize industrial capitalism as feudalism's internal contradictions had destabilized feudalism before it. Whether or not one accepts Marx's predictions, his diagnosis of industrialization as a total transformation of class, labor, family, and urban life remains one of the most comprehensive accounts of what changed and why.
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