Answer:
Seven weeks war of Austro-Prussian war played a main role in the process of creating Prussia as the leader of German unification. Franco-Prussian war led to formal unification of Germany.
Step-by-step explanation:
In the 19th Century German territories were divided into many states. That is why the idea for unification was formed. There were two strong factors that wanted to lead that unification. That were Prussia and Austria. After Prussia won the war, they took the main role. After this main opponent of Prussia was France as they wanted to take some French territories. Prussia defeated France, they took Alsace-Lorraine and officially proclaimed unification of Germany.