1940s

• different ideologies
• superpower rivalry
• february 1945


  yalta conference
• july 1945


  potsdam conference
• august 1945


  atomic bomb
• soviet expansion (east) - long telegram + iron curtain speech
• 1947


  containment - truman doctrine + marshall plan
• october 1945


  united nations
• 1948-49


  berlin blockade + airlift
• 1949


  cominform + comecon
• 1948


  yugoslavia