How did the franco-prussian war of 1870—1871 contribute to german unification?

german victory in the war increased nationalism and patriotism in germany.
french victory in the war united the germans against a common enemy.
the war resulted in wilhelm i becoming king of prussia.
the war showed that only military force could unite germany.

"German victory in the war increased nationalism and patriotism in Germany."

Explanation:

The Franco-Prussian War was the most important conflict that was fought in Europe after the Napoleonic wars and before the First World War and ended with the complete victory of Prussia and its allies. The most important consequence was the creation of the German Empire, which maintained a very influential role in the international political relations of the following decades. The French debacle also brought the end of the Second Empire of Napoleon III and, with the fall of it, the temporary subordination of the role of France in comparison with the other powers of European families. The end of the imperial era in France marked the beginning of the Third French Republic, which - in size and influence - became the most important republican regime among those then existing on the continent.

it would be  

germany had to pay all damages related to the war.

and i think

germany had to take sole responsibility for the war.

the reform movements that arose during the antebellum period in america focused on specific issues: temperance, abolishing imprisonment for debt, pacifism, antislavery, abolishing capital punishment, amelioration of prison conditions (with prison's purpose reconceived as rehabilitation rather than punishment), the humane treatment of animals, the humane and just treatment of native americans, the establishment of public institutions for the care of the destitute, orphans, blind, and mentally ill, the establishment of public schools, the abolition of tobacco use, vegetarianism, health reform, homeopathic medicine, woman's rights (including, at first, especially the establishment of a woman's right to own property apart from her husband and her right to sue for divorce), and the amelioration of labor conditions (including higher pay, the right to form unions, the right to strike, and the demand for limits on the number of work hours, and safe working conditions).

explanation: