The success of the currency reform angered the Soviets, who cut off all road, rail, and canal links between the western zones and West Berlin. This was the Berlin Blockade, which lasted from 24 June 1948 to 12 May 1949. In response, the U.S. and Britain launched an airlift of food and coal and distributed the new currency in West Berlin as well. The city thereby became economically integrated into West Germany. Until the mid-1960s, it served as "America's Berlin", symbolizing the United States' commitment to defending its freedom, which John F. Kennedy underscored during his visit in June 1963.