Observation
Explanation: Most humans learn more easily from observing what they are attempting to learn giving it the greatest influence on intelligence.
Potsdam When Germany surrendered.
Explanation:
When did Joseph Stalin refuse to allow eastern European countries to hold free elections. Potsdam When Germany surrendered.
At Yalta conference, the allied reached a rather vague agreement that the East European nations would create democratic institutions of their own choice,the Soviets were to administer those European countries they liberated with promised to hold free elections