The end of the Cold War refers to the period in the late 20th century when the prolonged geopolitical tension between the Soviet Union and the United States, along with their respective allies, began to dissolve. This culminated in significant political changes, such as the collapse of communist regimes in Eastern Europe, leading to the dissolution of the Soviet Union itself in 1991. The easing of hostilities marked a shift in global politics, paving the way for a new world order and changing international relations.