THREATS TO WORLD PEACE AFTER WWII This was the part of mounting (results) of political and ideological tension between the communist with socialist ideology led by the former USSR and the western block with capitalism ideology led by U.S.A. The cold war started after the former USSR became the most powerful nation leading the socialist nations in the world while U.S.A became the most powerful nation economically, politically and militarily leading the capitalist nation in the world especially after WWII of 1945. Factors for the rise of cold war/Causes 1. Ideological differences between the eastern block with socialist ideology and western block with capitalist ideology; hence the two ideologies existed in the world history since Russian revolution up to early of 1990’s led to the existence of the cold war between the eastern block following socialism under the former USSR and the western block following capitalism under U.S.A. 2. Russia motives of grabbing and occupying terr...