Contribution of Otto von Bismarck in German Unification:

1. Realpolitik:
Otto von Bismarck, as the Prime Minister of Prussia, implemented the policy of Realpolitik, which focused on practical and realistic actions to achieve political goals. This approach helped him in uniting the German states under Prussian leadership.

2. Wars of Unification:
Bismarck orchestrated three wars to achieve German unification:
- Danish War (1864): Prussia and Austria defeated Denmark and gained control of Schleswig-Holstein.
- Austro-Prussian War (1866): Prussia defeated Austria and established the North German Confederation.
- Franco-Prussian War (1870-71): Prussia's victory over France led to the unification of the German states into the German Empire.

3. Diplomatic Skills:
Bismarck's diplomatic skills were instrumental in isolating Austria and gaining the support of other European powers during the wars of unification. He also formed alliances with Italy and Russia to ensure Prussian dominance.

4. Leadership:
Bismarck's strong leadership and vision for a unified Germany inspired the people and rulers of various German states to support his efforts. His strategic decisions and political acumen played a crucial role in achieving German unification.

5. Constitution of the German Empire:
Bismarck played a key role in drafting the constitution of the German Empire, which established a federal system with a powerful central authority. This constitution laid the foundation for the unified German state.
In conclusion, Otto von Bismarck's contributions in implementing Realpolitik, waging wars of unification, diplomatic maneuvers, leadership, and constitution drafting were crucial in the successful unification of Germany under Prussian dominance. His legacy as the "Iron Chancellor" of Germany continues to be celebrated for his role in shaping modern Germany.