(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.