The Catholic Church is the reason why he got power quickly.
Workers were affected by scientific management because it caused workers to, in a sense, become replaceable. Workers, under scientific management, were considered to be parts in a machine which could be replaced. Correspondingly, specialization caused tasks to become routine, as workers were completing the same tasks repeatedly to a point were they became bored and exhausted of their jobs. This also led to there being a larger number of injured workers.
I think the most significant cause of World War one was the assassination of the Archduke Franz Ferdinand. The other causes of the war was Imperliasm, Militarism, Nationalism and Alliances that were formed.