The "Emancipation Proclamation" issued by President Lincoln as the Civil War came to a close declared slaves were to be freed throughout the entire US.
It was primarily "men" and "children" who formed the largest part of the factory labor force during the Industrial Revolution, since much of this took place before the government started regulating things like harsh labor conditions and child labor.
Answer:
I think it is C an increase in acid rain my apologies if I am wrong
Theres a link I left for you
