Italy and Germany were able to unify, in a big part because of B) nationalism. Due to a culture and ideology of the unity of these regions based on national identity there were movements that began to push these societies towards national unification.
If you're referring to the post WW2 period, then it was fairly simple, the United States wanted to create a democratic liberal country that would share their political goals in Europe, while the Soviets wanted to make it into a Communist state that would share their goals and ideals in Europe. Each would have their own central European country to control the remainder of Europe.
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The Battles of Lexington and Concord.
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