The Serbs and Greeks revolted due to A - They wanted freedom from Ottoman rule.
C, because that was basically one of the reasons for the Civil War as well. The Northern and Southern states were always fighting about whether slavery should expand west or not.
Yalta Conference is about the discussion on the action plan
when the war will end. During this conference, the motion to establish the UN
was set.
Potsdam Conference was the meeting of the three leaders at
that time, namely Stallin, Truman, Churchill. This conference added tensions
between the Soviet Union, and US.
Iron Curtain Speech set up cold was tension and was known as
the most famous speech during this time.
