History A-Level Coursework - HELP! Watch

Assess the significance of individual leaders in the emergence of Germany as a European and World power.
I have been given this question for my A-Level coursework and I am having trouble with it.

Was wondering if anyone has any information on the subject or if they have done the essay themselves

These are the individuals i'm using :
F.W III, F.W IV, Willhelm I, Von Roon, Von Moltke, Bismarck, Willhelm II