Why Did the Alliance Break Down between Britain, USSR and the USA

On the other hand they did agree upon the final boarders of Poland although the USA and Britain disagreed. They also agree upon the reparations bill.
The various disagreements the leaders had whenever they met was primarily to do with their very opposing attitudes. The primarily hates were between Stalin and Churchill, who were sworn enemies, while Stalin and Roosevelt were far more amiable when they met. This was mostly due to their ideological differences based on their respective governments.
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