My general thesis or prompt is that the US used their use of the atomic bombs in Japan to intimidate the USSR and scare them. During WWII, the US and the USSR were technically allies, but they were as close to enemies as allies can be. The USSR was a communist state, whereas the US was capitalist, and the US hated communism as a whole. When the US was in its war with Japan, the USSR stepped in near the end in hopes of gaining land in that area, and the US did its best to end the war quickly enough so that the USSR didn't get invested enough to claim land in that region of the world. This is one of the reasons the US used their atomic weapons, so that the war would be over and the USSR wouldn't take anything in that region. After Japan was done with, conflicts between the US and the USSR only heightened until the Cold War, when communism was going strong and Stalin was livin' large. During these times, the US and the USSR basically threw threat after threat at each other, hoping the other would back down.
Here are some of the sources I've gathered and used so far.
http://everything2.com/index
http://revolution.allbest.ru
http://www.megaessays.com
http://www.123helpme.com/view
http://www.anzasa.arts.usyd
http://www.essortment.com/all
http://www.philosophyparadise
