Final answer:
The industrialization period led to the expansion of the industrial workforce and increased diversity through migration, while also resulting in a rise in child labor.
Step-by-step explanation:
The subject of this question is Social Studies. It involves studying the industrial workforce expansion, increasing diversity through internal and international migration, and the rise of child labor during the industrial era.
During the industrialization period, industrial growth led to the migration of people from rural areas to urban centers in search of job opportunities. This mass migration resulted in diverse populations in cities. Additionally, child labor increased during this time, as children were often employed in factories and fields.
Overall, the question revolves around the social and economic changes brought about by industrialization and their impact on the workforce.