Answer :
The german states and the emergence of the german empire lead to tensions in europe because several nations started forging alliances out of fear that Germany would invade them.
The formation of a sizable, affluent, and powerful nation-state in central Europe as a result of Germany's unification drastically upset the delicate "balance of powers" established by the Congress of Vienna. Additionally, it serves as a case study for the more general idea of "nationalism" as a historical force.
History-making advantages of German unification include independence from authoritarian control, increased freedom of expression and movement, expanded democratic participation rights, and the avoidance of a potentially explosive military clash in Central Europe.
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