The critical agreement that marked the end of the Cold War era was the Fall of the Berlin Wall on November 9, 1989, symbolizing the collapse of communist regimes in Eastern Europe. This momentous event led to the reunification of Germany and encouraged democratic movements across the region. It catalyzed subsequent agreements, such as the 1991 Strategic Arms Reduction Treaty (START), establishing frameworks for nuclear disarmament and cooperation. The end of the Cold War fundamentally reshaped global politics, transitioning from a bipolar world to a unipolar one dominated by U.S. influence, subsequently affecting international relations for years to come.