why did the grand alliance break down

• lack of trust

  • russia had a defensive alliance with hitler which caused suspicion
  • soviets didn't trust british or american pilots
  • didn't share important info like atomic bomb (US) or breaking german code (UK)
  • stalin didn't share battle plans
• ideological differences

  • USSR - communist
  • US + Britain - capitalist
  • caused disagreements at Potsdam
  • capitalists wanted Germany to recover for trade
  • Stalin wanted Germany to be de-industrialised and Poland as a buffer