Step-by-step explanation:
1&6
Germany was split into 2 after the end of ww2 with the west going to the western powers of the uk, USA and France, and the east going to the more communistic country of the soviet union. Berlin was deep in the eastern zone but was split among the 4 powers. the west had to travel through the soviet eastern Germany to get supplies to Berlin. in the 1950s the soviets wouldn't allow supplies to get to east Berlin in a attempt to starve out the western side of Berlin. the two sides prepared for war but then the allies just used airplanes to get supplies to the other side which is now known as the Berlin airlift
2
the true man doctrine sought to stop the spread of com