To stop the flow of people leaving east Germany and going to west Germany. (Mind that this is in Berlin the city itself.)
This wall helped a little keep small invaders out because it provided a wall that was difficult to get over. But it wasn’t good enough to stop big invasions because a large amount of people would overwhelm the guards.
6 is D that’s super easy learned it before
Difference between isolationism and internationalism. Isolationism= don't get involved at all, purposely ignore affairs. Internationalism= get involved in everything, purposely try to control affairs.