During the 1930s, both the USA and Britain had been critical of the methods used by Stalin to industrialize the Soviet Union and the human cost involved
Britain and the USA were suspicious of the soviet union because they have different political beliefs
The soviet union was suspicious of Britain and the USA because they thought they wanted to destroy communism
The USA was suspicious of Britain because of their imperialism
In November 1943 there was a meeting in Tehran between the leaders to discus how to defeat Hitler
In February 1945 there was a meeting in Yalta to discus what to do with Germany after the war
In Tehran they decided Britain would open a second front with Germany, and Stalin would declare war on Japan
In Yalta, they decided they would set up the UN, Germany would be split into four zones and Polands boarders would be returned to original
In July-August 1945 there was a meeting in Potsdam to finalise the plans for after the war
In Potsdam they decided to also split Berlin into four zones and the country in control would pay for it's reparations
On 6 August 1945 the USA exploded an atom bomb over Hiroshima (a japanese city) and killed 120,000 civilians
The use of the atomic bombs made Stalin want to create a buffer zone of communist friendly countries around the USSR (the soviet satellite states)
On 9 August 1945, the USA dropped another atomic bomb on Nagasaki
By 1964, Britain, China and the USSR also had atomic bombs
The atomic bomb increased tensions in the cold war because they were more reluctant to go to war but had started an arms race
George Kennan's long telegram in 1946 from the Soviet union to America reported that Stalin wanted the destruction of capitalism and but believed that everywhere wanted to destroy communism
The American government wanted a form of containment to stop communism spreading
The Novikov telegram said that the Soviets thought equally poorly of the west and that the USA wanted to use their military power to dominate and not co-operate with the USSR any more so they wanted to protect themselves
In March 1946 Winston Churchill was no longer prime minister but he gave a speech saying there was an 'iron curtain' between the west and the east
in 1944-5 the USSR freed eastern European countries from Nazi control and turned them into satellite states with communist governments
Truman saw the satellites states as proof Stalin wanted to spread communism and the made tensions between them worse
After the war communism looked attractive to poor people