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The French Revolution
The French Revolution had a postive effect on Germany, by inspiring them to become unified. (Seconday source) -
Napoleonic System
The Napoleonic System grouped all of the German states together, and just made it Germany to make ruling easier. This created nationalism, a sense of unity due to a common hatred of Napoleon in this case. Although Napoleon did a lat of bad things, he did have a positive effect on Germsny, even if it was accidental. -
Zollverein
The Zollverein basically incouraged trade and economic dependence on the neighboring Germsn states, giving Prussia more power and making the Geman states work together. This was economically a positive effect. -
Otto Von Bismarck
Bismarck's sole goal was to make a unified Germany with Prussia being the leader, and he succeded. I would say he had a great positive effect on Germany.