Ninety-nine days after the Western Allies introduced a new deutschmark to stabilize their occupation zones, Josef Stalin ordered every road, rail line, and canal between West Germany and West Berlin sealed shut. On June 24, 1948, <cite>the Soviet Union made overland travel between West Germany and West Berlin impossible</cite>, stranding 2.5 million civilians and daring the West to back down. Instead, British and American commanders launched the Berlin Airlift, flying in coal, food, and medicine around the clock, peak operations saw one cargo plane land every 45 seconds at Tempelhof Airport. Stalin lifted the blockade in May 1949, having won nothing. The standoff hardened the division of Germany into two rival states, accelerated the founding of NATO, and established the defining logic of Cold War confrontation: that neither superpower would fire a shot, but neither would yield an inch of symbolic ground. Every modern crisis over freedom of movement, from checkpoints to sanctions, carries the fingerprints of that summer in Berlin.