Napoleon groups of the German states into a new confederation, the Confederation of the Rhine. This united the Germanic people into one region and made them realize how similar they were through their cultures, languages, and common interests.
After the Congress of Vienna, the German states were reorganized into the German Confederation. This grouping united them in their own German country, but this time Napoleon wasn't ruling it.
The Zollverein positively affected the German Confederation by uniting the economies between each state. This made each state more dependent on the other and the leaders of the states within the Confederation.
Otto von Bismark elected Prime Minister of Prussia. It was the beginnings of a strong leader who would lead the German Confederation to unification through 'iron and blood'.
Prussia prevented Denmark from gaining Schleswig and captured Holstein from Austria. Prussia expanded its land and was prideful of their militaries achievements.
The North German Confederaton is founded after the Seven Weeks' War and the Treaty of Prague. The German Confederation dissolved into this, and it only needed the southern German states to be fully German nation. This was a positive step towards the unification of Germany.