Question

industrial revolution
productivity and growth
the invention of the ________ allowed factories to stay open beyond daylight hours.
assembly line
lightbulb
television
extended explanations: question
the invention of the lightbulb allowed factories to operate beyond daylight hours, introducing the concept of the \third shift\ (working through the night). extended hours led to a boost in production, contributing to the growth of urbanism.
americas industrial pioneers

Explanation:

The lightbulb provides artificial light, enabling factories to operate when there is no natural daylight. The assembly line is related to production methods (organizing workers and tasks for efficient manufacturing), not lighting. Television is for entertainment and information dissemination, not relevant to factory lighting for extended hours.

Answer:

lightbulb