<em>B. Soviet building of the Berlin Wall.</em>
Explanation:
After World War II ended, Germany got split up amongst the Allied powers. The United States, France, and Great Britain got West Germany, while the Soviet Union got East Germany.
The Soviet Union centered around communism, so East Germany had a communist government. Many Germans realized they did not want to obey and live under this government and wanted to flee. East Germans started leaving and moving to West Germany.
Over time, East Germany started to become fearful that too many people were leaving and decided they needed to do something about it. They built the Berlin Wall that was heavily guarded and hundreds of people ended up dying trying to get through.
This was the first cause of tension between the Soviet Union and President Kennedy. Both John F. Kennedy and Ronald Reagan gave speeches about the wall and how horrible it was.
Answer/Explanation:
A traditional war is where two or more countries are fighting each other directly, like WWI or WW2. Traditional wars are (as they sound) traditional. These are how most wars were fought throughout history. A proxy war is where a war is instigated by one or more major powers but the major power itself does not actually get involved.
A good example would be the Cold War. The Cold War had many proxy wars within it; for example the Vietnam war. In the Vietnam war, the North was communist and the south was not. The Russians (USSR) was supplying North Vietnam and the Viet Cong (VC) with training and weaponry such as guns, tanks, planes, etc. But Russia (The USSR) never actually fought in the war itself, while America and their plan to contain communism, went and fought directly in Vietnam.
You can use parentheses. Order of Operations (PEMDAS) prioritizes parentheses above anything else, so you will do the operation in parentheses first.