Final answer:
Bismarck aimed to strengthen Prussia and unify Germany, using Realpolitik and military strategy to achieve his goals, leading to his appointment as Imperial Chancellor of the new German Empire.
Step-by-step explanation:
After Otto von Bismarck rose to chancellor, he was determined to increase Prussia's power and ultimately achieve the unification of Germany under Prussian dominance. He used Realpolitik, a pragmatic and realistic political strategy, strengthening the military and advancing through decisive wars with Austria, Denmark, and France. Bismarck's efficient military campaigns and political strategies excluded Catholic Austria from German affairs and successfully annexed key territories, culminating in the proclamation of the German Empire in 1871 with Bismarck as its first Imperial Chancellor.