Dear Student,
The main processes through which Bismarck achieved the unification of Germany were
1. The Danish-Prussian war in 1864: Prussia under Bismarck united with Austria to defeat Denmark. Through this war, Bismarck managed to unify the territories of Schleswig and Holstein into Prussia.
2. The Austro-Prussian war of 1866: Bismarck turned against his former ally Austria in 1866 and defeated it. Prussia could now dominate the other German states without fear of intervention by Austria.
3. North German Confedration, 1866: With Prussia defeated, Bismarck formed the North German Confederation in 1866. It was led by Prussia and had 17 other small northern German states.
4. Franco-Prussian war, 1870-71. This was the final step in the process of German unification. France was defeated and Prussia was able to gain control of Alsace and Lorraine.