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.

I hope this helped.

d. it gave farmers a way to organize for more political power