Select ONE factor from the Cold War era (from the list below) that resulted in increased tension with the Soviet Union and explain why it is the best choice. i) Yalta Conference, ii) Berlin Airlift, iii) Truman Doctrine, iv) Korea, v) arms race, vi) CubaProvide the political context of decisions made from the American perspective regarding the choice you selected. Contrast your choice with another factor pointing out reasons why it was more significant overall.