We don't want no stinkin' Canadian documents! j/k
Anyway, if you want to trace the cold war back to a secondary cause or two, it's Britain and France. First off, Napoleon did a little fight that set back Russia a tad. With that disturbance in their system (Not to mention the Russian burning of Moscow), it opened them more for a Communist era of power.
Britain is the more direct (especially for Korea and Viet Nam wars/conflicts) cause. By taking advantage of India's fragmented condition, they were able to subdue the people and turn them into a colony. From there, they produced opium. They managed to abuse the generous Chinese trade agreement and addict the richest nation in the world to their Indian opium. Then, when China stopped importing it, Britain declared war. In that state, there wasn't too much of a war, and Britain (And other European nations, America as well) could futher abuse the weaked trade power of China and funnel its wealth away. Japan, grabbing claims in Manchuria, got into a little spat with Russia in the Russo-Japanese War. The US mediated, and both sides were left somewhat unhappy. Japan was elated, most likely, by their stunning victories against the larger European-Asian power.
When WW2 rolls around, Japan, strengthened by their prior victories and political power, were able to invade China quite effectively and do their own 'bad thang' (the rape of Nanking, among others) to the Chinese, futher pushing them into economic losses. Post-war China was ripe for a Communism Government to appease the lower classes. China has their civil war and becomes Communist, with the exception of Formosa (Taiwan), which, technically is still debated over. I feel inclind to say they are their own government, but prior Chinese (People's Republic of) policy claimed that they are a part of the main nation. At any rate, the Cold War between the Soviet Union and the United States was influenced by China. Just as it was influenced by Viet Nam, Korea, Western Europe, and lots of places.
Anyway, there's a lot of history, and causes and effects, unless very direct, are often opinionated and debatable.
Note: Chile was neutral in WW2, but which side did it contemplate joining, Axis or Allies?
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Although the names change
Inside we're all the same
Why can't we tear down these walls?
To show the scars we're covering...
Creed, "Inside Us All"