D is the answer ( for cutting off our trade with parts of the world )
The afereffects of the Second World War, which finally ended in 1945 were many and varied. One of the biggest, was a conflict that arose between the then recognized two opposing super powers, the United States and the Soviet Union, known as the Cold War. The reason for this conflict, and which originated from the strife between the two nations over who was more powerful and had more control in the world, was the huge opposing views on how life should be handled. The U.S believed strongly in democracy while the Soviets believed in Communism. Another reason for the power struggle between the two nations was the use by the U.S of nuclear power, which made the Soviets initiate a marathon of nuclear arming, which in turn increased the problems between the two. Whatever the case, this power struggle between these two nations led to one of the biggest divisions in the world and it happened when, after the Great War, the Soviets, who had taken control of most of Germany and Berlin, decided to separate their portion of the city and country with the creation of a huge mortar and brick wall in 1961. This became known as the Great Berlin Wall. This Wall became the paragon and clearest evidence of the division and conflict that was arising once again. But after several revolutions took place in 1989, especially Hungary and Poland against Communist control, the people in Eastern Germany decided to rise as well and in June 1990 up until almost 1992 the demolition of the Wall began. This event showed the shift that President Reagan was asking for, the decision to accept democracy and adopt a more open policy for the sake of peace and the wellbeing of the people.
