Why did the Blockade go up and why did Truman begin an airlift?

Why did the Blockade go up?

The Soviet Union left the Allied Control Council in March 1948, which ruled Germany occupied over this issue.   The Soviets denounced this move as an assault on the East German currency, and a blockade of all Berlin-West rail, road and water communications began on 24 June.

Why did Truman begin an airlift?

In reaction to the Soviet land route blockade into West Berlin, the U.S. is launching a major airlift of food, water, and medicine for the people of the besieged city. The Soviet action was in reaction to American and British officials refusing to allow Russia to have more say in Germany's economic future.

~MistyMia~

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.