This document discusses different historical perspectives on the origins of the Cold War between 1945-1991. It begins by providing context for rising tensions between former World War 2 allies the US and USSR. It then outlines the traditional, revisionist, and post-revisionist views that emerged in the West. The traditional view blamed Soviet intransigence, while the revisionist view saw US economic imperialism as the cause. The post-revisionist view argued it was a complex interaction between both sides. Soviet views also evolved over time from solely blaming US imperialism to more nuanced accounts after Stalin's death.