Why did the us airlift supplies into west germany for over a year

Why did the US airlifted supplies into west Germany for over a year because of the Berlin Wall.  Truman ordered a massive airlift of supplies into West Berlin as an effort to avoid WWII. On June 26, 1948, the first planes took off from bases in England and western Germany and landed in West Berlin. For nearly a year, American planes landed around the clock.

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. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

the correct answer is ''the programs costs have risen dramatically in the recent past'' hope this !