What factors slowed down germany’s industry

Germany was politically divided in the early 1800s. Also the world war would have slowed down the process of keeping industries up. Not sure if this helps all that much but I'm not sure which era or exact time you meant when asking.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.