D) the Japanese emperor declared himself the head of Shintoism to unite people in isolated parts of Japan
Around that time, men were off in the war, leaving women to work the factory jobs. They had more work as more men fought.
Answer:
The Industrial Revolution saw the rise of factories in need of workers. Children were ideal employees because they could be paid less, were often of smaller stature so could attend to more minute tasks and were less likely to organize and strike against their pitiable working conditions.