Question

in 1871, king wilhelm of prussia was proclaimed \________\ of germany. bismarck became his chancellor. thus, germany was born. baron kaiser pope president

Explanation:

In 1871, after the unification of Germany, King Wilhelm of Prussia was proclaimed "kaiser" (emperor in German). "Baron" is a lower - level noble title. The "pope" is the leader of the Catholic Church. A "president" is a title in a republic, and Germany at that time was an empire.

Answer:

kaiser