The rapid industrialization of the United States during the "Gilded Age" (a term describing the period covered by this unit, referencing a glittering surface appearance that concealed significant underlying social problems) was significantly driven by:
- **A)** Abundant natural resources (including coal, iron ore, and oil), significant technological innovation, an expanding railroad network (building on the transcontinental railroad's own completion already discussed in the previous unit), a large and growing labor supply (fueled significantly by the immigration discussed further below), and substantial capital investment - this combination of factors together drove the United States' rapid transformation into one of the world's leading industrial economies during the period covered by this unit, a transformation with significant social and economic consequences discussed at multiple points throughout this unit
- **B)** Industrialization during this period having no meaningful, describable relationship to natural resources, technological innovation, railroad expansion, or immigration-fueled labor supply already discussed at various points throughout this unit and the previous unit
- **C)** A significant national economic decline and de-industrialization throughout this period, the general opposite of the substantial industrial growth that actually characterized the United States during this specific period
- **D)** A national economy that remained, in fact, entirely agricultural throughout this period, with no meaningful industrial development of any kind occurring anywhere in the United States during the period covered by this unit
Rapid industrialization during the Gilded Age was significantly driven by abundant natural resources, significant technological innovation, an expanding railroad network, a large and growing labor supply fueled significantly by immigration, and substantial capital investment. This combination of factors together drove the United States' rapid transformation into one of the world's leading industrial economies, a transformation with significant social and economic consequences discussed at multiple points throughout this unit.