What did bismarck mean by the phrase "blood and iron" in the context of the question of german unification?

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

just like you man, i personally think its either c or d

explanation:

but good luck with the test man