How did Otto von Bismarck justify his opinion about future wars given his opinion about past wars?

Germany became a modern, unified nation under the leadership of the “Iron Chancellor” Otto von Bismarck (1815-1898), who between 1862 and 1890 effectively ruled first Prussia and then all of Germany. A master strategist, Bismarck initiated decisive wars with Denmark, Austria and France to unite 39 independent German states under Prussian leadership. Although an arch-conservative, Bismarck introduced progressive reforms—including universal male suffrage and the establishment of the first welfare state—in order to achieve his goals. He manipulated European rivalries to make Germany a world power, but in doing so laid the groundwork for both World Wars.

Explanation:

where are the answer choices

that would be the steamboat because none of the other things are forms of transportation