Mass industrialization began as the First and Second Industrial Revolutions started their engines. Name that century.

Answer 19th century

The Industrial Revolution really began to unfold in the 19th century, when steam power changed the way of the world in Britain and beyond. By the 1830s and '40s, the First Industrial Revolution took hold, transforming agrarian societies into industrialized ones and resulting in mass migration from rural villages to urban centers. The Second Industrial Revolution kicked off later that same century, when the electric, steel, and automobile industries were on the rise.

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