14. The Fall of the Soviet Union (1991)
On December 26, 1991, the Soviet Union officially dissolved, ending decades of Cold War tensions and redrawing the map of Europe and Asia. The collapse of the USSR led to the emergence of 15 independent nations and marked a significant shift in global politics. The news of the dissolution stunned the world, signaling the conclusion of an era and the beginning of a new geopolitical landscape (bbc.com).
