The document summarizes key events in Europe and North America from 1945 to the present related to the rise of the Cold War between the United States and Soviet Union. It discusses post-World War II conferences at Yalta and Potsdam that divided Germany into occupation zones. It also describes the Truman Doctrine and Marshall Plan that aimed to contain the spread of communism and rebuild Western Europe economically. The Berlin Airlift is mentioned as a response to the Soviet blockade of West Berlin as tensions escalated between the two superpowers.