The great and all powerful Soviet Union, and then after 1949 the communist german party took controlled which was maintained by the United Soviet Socialist Republic (USSR). Also I should mention that the Allies wanted to split the city of Berlin up since it was fair.. So Berlin was split in 4 parts and thats why you hear the name "Berlin Wall" which was the Soviet Wall surrounding their side of the city..
This image is from the battle of Berlin won by the Soviet Union in 1945
Nationalism has increased the tensions among nations in Europe. The main reason for this is that this resulted in intense competition among these nations. Each wanted to overpower one another. In French nationalism, what resulted to this nationalism is that, France and Germany became rivals in face for naval superiority. The answer is the last option.
Energy shortage, lack of fresh, clean water, and lack of monetary resources are overpopulation issues.
Over the last half century the population of the world has exploded, and it is also the culprit of the environmental challenges facing the planet today.
Overpopulation refers to the phenomenom in which the number of existing human population exceeds the carrying capacity of Earth.
Reduced mortality rate, better medical facilities, depletion of precious resources are few of factors that may result in overpopulation.
I believe it is because of his foreign policy.