Recap: During WWII the alliance of the USA and the USSR brought together two sides that were divided by their political ideologies. The political and economic systems of the USA and Britain were based on capitalism, while since its foundation after the 1917 Russian Revolution the USSR had based its economy on communism. However, the actions of Nazi Germany and its ally, Japan, in World War Two had driven these two political enemies together. As the war dwindled down, two conferences were held between the United States, Britain and Russia/USSR to determine the outcome of WWII.