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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"the attempts of the proletariat to rise above this abasement"

the steam engine.

the locomotive.

the telephone.

the telegraph.

the internal combustion engine.

the rifle.

ironclad ships.

electricity/light bulb.