A lot of it was because of currency issues.
Right after World War II ended, all of Germany was using the Reichsmark. The Germans weren't allowed to manage it, though; the British, French and US handled it in the western sectors, the Soviets in the East. The Sovs decided to destabilize Germany economically and printed Reichsmarks so fast they lost value. The Western allies decided to create a new currency, the Deutschmark, that would be managed by the West Germans.
This made the Soviets mad and, the day after the DM was rolled out, they set up a blockade of all rail and road traffic into or out of Berlin, and required water shipping to receive special Soviet permission.
The intent was to force the West Germans to hand themselves and their land over to East German control, or to get rid of the Deutschmark. Unfortunately for them, the US and British Air Forces had enough cargo planes that by flying 24/7 they could adequately supply West Berlin until the Soviets gave up, which they did about a year later.
what was western allies response to the berlin blockade
The Berlin Blockade (defeated by air transport planes from West Germany) was in 1948. The Berlin Wall was built in 1961 and lasted until 1989. The Berlin Blockade was first, before the construction of the Berlin Wall.
The population of West Berlin at the time of the blockade and airlift (1948-49) was about 2 million.
To isolate East Berlin from West Berlin
Hitler was the king of Berlin.
Berlin Blockade
The Berlin Airlift
No. The Soviets instituted the Berlin blockade, so the allies initiated the Berlin airlift to get supplies to civilians inside the blockaded city.
The Soviet Union did not blockade its own zone, so the blockade applied only to the three Western sectors of Berlin: it did not 'extend out'.
To isolate East Berlin from West Berlin
The Berlin Blockade was supposed to cause the allies to give up western Berlin to the Soviet forces, but instead the allies constantly airlifted supplies past the blockade until it was lifted.
Did the Berlin blockade force the western powers to leave the city