Bismarck encouraged war with Danmark, Austria and France to unite Germany
Germany
Germany was forbidden to unite with Austria in based in the Treaty of Versailles. Many countries come to the conference but Germany was left out and was not allowed to form a super state with Austria. It was believed that were a union to occur between Germany and Austria, it would result in a state too powerful to be counterbalanced by Britain and France.
By "BLOOD AND IRON"
Germany.
As regards similarities between Bismarck and Patel, I have no specialized knowledge. Both of them used a 3-stage system for uniting their countries; 1) Invite Union, pointing out the advantages. 2) Take advantage of the fact of human nature that people who will not unite FOR anything will unite AGAINST something - Austria/France, or Britain/Pakistan. 3) By the time only a few states are left outside the Union, the Union will be strong enough to incorporate the rest by force.
Otto Von Bismarck
Germany was forbidden to unite with Austria in the treaty of Versailles.
Austria and Germany united because Austria was in fear of being overthrown by the Germans if they didn't unite with them.
Anschluss
Otto von Bismarck
To unite the native Americans