The significance of the Berlin Blockade (1948-1949) in shaping Cold War tensions cannot be overstated. This event involved the Soviet Union blocking all ground routes to West Berlin, prompting the Western Allies to organize the Berlín Airlift to supply the city. This crisis exemplified the deep ideological divide between the East and West, solidifying the contours of the Cold War and contributing to the eventual formation of NATO and the Warsaw Pact, as each bloc sought to consolidate its influence in Europe.