(i) Otto Von Bismarck, the chief minister of Prussia, was the architect of unification process, which he carried out with the assistance of the Prussian army and bureaucracy.(ii) Three wars over a period of seven years with Austria, Denmark and France were won by Prussia and completed the process of unification.(iii) In January 1871, the Prussian King William I was proclaimed as German Emperor in a ceremony hold at Versailles.