Draw a conclusion about the role of war in uniting Germany.
1-the Francisco-Prussian war did not convinced German states to unite under one nation-state
2-the Francisco-Prussian war convinced German and French states to unite under one nation-state
3-the Francisco-Prussian war, convinced Otto von Bismarck that his cause of uniting Germany was correct
4-the Francisco-Prussian war, convinced German states to unite under one nation-state
Based on the given options, the conclusion that can be drawn about the role of war in uniting Germany is:
3 - The Franco-Prussian war convinced Otto von Bismarck that his cause of uniting Germany was correct.
Based on the given options, the conclusion would be:
4 - The Franco-Prussian war convinced German states to unite under one nation-state.
Please note that this conclusion is specific to the given options and may not encompass all the complexities and factors involved in the process of German unification.