Question

which development helped improve working conditions in many mines and factories during the late 1800s

Answer 1

the growth of labor unions

Step-by-step explanation:

Answer 2

During the late 1800s, the developments that helped improve working conditions in many mines and factories are due to more resources was discovered, many factories upgraded their facilities from small to large scale production, more investors were coming, the increase in the labor force and policies were improved.