First thing to know is that both Marx and Engels thought that the socialist system was perfect. And it was, in theory. Former Yugoslavia was one respected by the West and the East countrys.
The socialist system had the idea of public gain and public lose. Everything was public (but controlled by the country) both losses and gains. But in practice it was different.
The capitalist system idea was based on personal gain and personal lose. You had what you earned, and it was yours. Whether that was high lose or high gain it was controlled by you, not yhe country.
Now this is all in theory. Both systems failed because no theory or idea can be put to practice perfectly.
Now to answer your question. They believed the capitalist system would fail because everyone was working for their personal gain. Unlike the socialist system where everyone worked for the good of the public.
Hope you are satisfied with the answer. ;)
P.S. I know the answer is long, but I like to explane where my answer comes from.
Answer:
The Nile River, the Tigris and Euphrates were in Mesopotamia. Caspian Sea is near Russia
Hope this helps!
Answer: Each country had its own agenda about the post-war world.
Context/explanation:
Churchill in particular, along with Roosevelt, pushed strongly for Stalin to allow free elections to take place in the nations of Europe after the war. At that time Stalin agreed, but there was a strong feeling by the other leaders that he might renege on that promise. The Soviets never did allow those free elections to occur. Later, Winston Churchill wrote, "Our hopeful assumptions were soon to be falsified." Stalin and the Soviets felt they needed the Eastern European nations as satellites to protect their own interests. So one key point of disagreement between Stalin and the other two was over the direction things would take in Eastern Europe after the war.
While Winston Churchill and Franklin Delano Roosevelt were on the same page in many ways, there were also key differences between them. As noted by The Churchill Project of Hillsdale College, "FDR, ever the optimist, believed (or wanted to believe) that Stalin could be convinced that the West was not committed to destruction of the Soviet regime." Churchill had a much more skeptical view of Stalin and the Soviet Union and approached the relationship in a firmer fashion. Roosevelt had hoped to continue cooperation with the USSR. That changed under Truman, who took over the US Presidency after FDR's death. Truman was strongly anti-communist in his stance.
Another difference between Roosevelt and Churchill pertained to colonialism and imperialism. Again as noted by The Churchill Project: "Over colonialism. Roosevelt firmly believed European colonialism had been a major cause of World War I, and that it had continued to be a source of international disputes and tensions before World War II. Churchill had sworn defend the realm, which, when he took office, included the British Empire." As it happened, after World War II, colonialism's days were numbered and independence movements broke out around the world where imperial powers had dominated.