The one-child policy had people pay special fees as punishment for having more than one-child. This led to a large number of hidden undocumented children that were hidden to avoid breaking the law. This mostly occurred in rural areas and was a big problem for the government.
Answer:
The second is the Industrial Revolution, and that involved the shift from farms to factories. ... Families were separated during the day, and children of the working class often had jobs in factories or coal mines (instead of going to school) because the family needed that income. Laws would later outlaw child labor.