Who Was Responsible For The Cold War? ~Revisionist historians tend to regard the outbreak of the "Cold War" as a result of American hostility or, at least , diplomatic incompetence, while the more traditional view lays the responsibility squarely at the feet of the Soviet Union. Assess the validity of each view. The Cold War,said to have lasted from the end of World War II to the dismantling of the Soviet Union in 1991, was one of the most significant political events of the 20th century. For nearly 40 years the world was under the constant threat of total devastation, caught between the n