 Complete the following phrase:  In the immediate postwar period it was possible to believe that the division of Germany into four separately administered zones might be a relatively short term expedient. After 1948 it became harder to believe in German reunification as a practical proposition. The events leading up to the 1948 Berlin Blockade made it clear that reunification on Soviet terms could never be acceptable to the United States and reunification on western terms could never be acceptable to the Soviet Union. Through the 1950s cold war tensions grew, leaving Germany with one of the most technically sophisticated and deadly borders in the world, not on its outer edge, but 