This document provides an overview of the Cold War and changes in Europe since World War II. It discusses how the Cold War began due to agreements at Yalta and Potsdam that divided Europe into Western and Eastern spheres of influence led by the US and USSR respectively. This led to the formation of opposing military alliances, NATO and the Warsaw Pact. Decolonization in the post-war period changed European demographics. The Cold War tensions eased in later decades due to détente policies and the collapse of the Soviet Union in 1991. Europe experienced economic growth and integration, culminating in the establishment of the European Union.