To the USA and Britain, free elections meant political competition for votes. But Stalin believed only communist parties should run in elections as they were the only parties that truly represented the people
Tensions were high at Potsdam. Roosevelt had died and Harry Truman had succeeded him as US President, who was more suspicious of the USSR and less willing to compromise
Britain and the US were alarmed by Stalin's actions in Poland - he was installing a government consisting of only pro-communist members, which they felt went against the Yalta agreement
The USA had a democratically elected government, its economy was based on private ownership of property, free competition and forces of supply and demand, and its population was mainly Christian
The USSR was a single-party state, its economy was controlled by the state with no private ownership of property, and the Communist Party promoted atheism and discouraged religious beliefs and practice