Causes of the Cold War

The Cold War is still a bit foreign to me so I'm sure my perspective will change, but I think political causes were to blame here. Normally I would look towards economics without doubt, because everything normally results in money. But before the Cold War, I feel like people had learned their lessons economically from WWI; they saw that they needed to help other economies rebuild in order for everything to keep moving. Even the U.S. saw this in Germany. But politically, I think this is where it fell apart. Communism was still such a huge fear across the globe, and nations were being very protective in order to stop it from spreading. If a nation started to lean towards communism, they were bombarded and told to go the opposite way. With the USSR trying to rebuild itself and prosper once again through communism, western Europe was panicked because such a large nation could not become communism. It even came down to a giant wall being built to separate a nation; something I find truly ridiculous.
As for as socially, I'm unsure of how it played a role in the Cold War; I will be looking for what other people say about it. To me, it just wasn't a big factor, but I don't think you can discount anything that may have possibly aided in starting a major crisis.

My Prezi

My prezi was about the turning points of WWII. So the summary is: because Germany was fighting 2 fronts basically all at once (western and eastern) I picked what is considered the battle in each front that turned the tides of the war. In the West, it was the Battle of Britain; this is where Germany attempts to take control of Britain because they're the last remaining threat but Germany ultimately fails to do so. This is significant because 1: it was the first time Hitler's plans had greatly failed, and 2: had Germany been successful, Hitler would have completely taken the West and been able to focus all its energy on the East. So, in the East, the turning point was the Battle of Stalingrad; this is where Germany tried to push through to Moscow to take a hold of Russia, but horribly loss. It is significant because this was the battle that gave the Allies hope in defeating Hitler and Germany.
Here's the link:
http://prezi.com/wrzft540itkn/turning-points/

Hitler's Obsession

Alright, so, this reading is all about Hitler's and the High Command German Army's descent into Russia and Moscow. This author seems to write about Hitler's faults and weaknesses as a commander a little more heavily than we've read before. Most of this comes from Hitler's one, main obsession: glory.
 So I have two questions to discuss about this:
1) Hitler was completely untrained in commanding a military and made unrealistic strategies for the Army; so why did the commanders go along with it? They warned Hitler against his ridiculously suicidal plans but never actually stood up against him. Why? They had the masses so why not take a better, smarter course of action without his consent to show him what they were talking about? Was it because of the ever prominent Nazi fear?
2) Hitler and the German government were extremely frustrated with the Japanese decision to attack Pearl Harbor and to declare war on the U.S. But this all changed when Pearl Harbor was such a success for the Japanese; Hitler upon seeing this immediately decided to declare war on the U.S. as well, going against the Tripartite Pact. If Pearl Harbor had failed, do you think Germany would have ever declared war on the U.S.?