Otro con Bismarck made civil ceremonies the legal way to marry in:

Germany.

Explanation:

The process of civil marriage is when a couple gets married and gets registered through a government official and legally accepted. This type of marriage ceremony allows for an inter-faith marriage and also performed, recognized, and recorded in the governmental office.

While civil ceremonies were initially the main form of marriage in Germany, especially during the reign of Napoleon. But with the fall of Napoleon, the ides of civil marriage also began to decrease. In no time, marriage can be registered in a religious manner or a civil office, with people having the option to chose either one of them. But in 1875, Otto Von Bismarck introduced a bill in the Reichstag known as the "Civil Marriage Law" which became the only legal law that allows marriage to be registered. Thus, from then on after the unification of Germany, civil ceremonies became the only legal way for a couple to be married in Germany.  

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