The Berlin Blockade was a significant event during the early years of the Cold War, occurring from June 1948 to May 1949, when the Soviet Union blocked all ground routes to West Berlin in an attempt to exert control over the entire city. This blockade was a direct response to the introduction of a new currency in West Germany and the merging of the western zones, which the Soviets viewed as a threat to their influence. The United States and its allies responded with the Berlin Airlift, delivering supplies to West Berliners and showcasing the escalating tensions between East and West.