what problems arose because of the increase in industry during the early 1900s

Answer 1

Check these sites.

http://findarticles.com/p/articles/mi_m0906/is_22_48/ai_54965773

http://findarticles.com/p/articles/mi_m0JAX/is_1_50/ai_78398531/pg_4

http://www.yale.edu/ynhti/curriculum/units/2004/1/04.01.08.x.html