Answer:
It is B.) It allowed Germany to focus all their efforts on the Western Front.
Explanation:
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D. He published a newspaper that spoke out against slavery.
Immediate conflicts:
... The USA had atomic weapons and the USSR did not. (The US would not share that technology with the Soviets.)
... The USSR did not assure that free and fair elections took place in Eastern Europe -- it saw to it that Soviet-aligned governments were installed there.
... Tensions over the East Germany / West Germany and East Berlin / West Berlin division of territory.
Deeper causes:
The USA was committed to capitalism and democratic institutions of government.
The USSR was committed to communism and imposed authoritarian government.
The Cold War was mostly a tension between these worldviews.
William McKinley set up his campaign headquarters in Chicago Illinois when he ran against William Jennings Bryan