In the twelve years after the founding of the GDR, about 2.5 million people fled the country and went to the FRG. They wanted better living conditions and freedom of opinion because the GDR did not allow any political views that were against the government. To prevent this mass migration of people to the West, the GDR built a wall around West Berlin in August 1961. Moreover, it also renovated the 1800 km long border fence to the FRG with spring guns and made it a ‘death strip’.
After the three Western powers single-handedly introduced a new currency, the Deutsche Mark, in their zones in 1948, the USSR reacted to this angrily and blocked Berlin. It shut down all channels of supply to West Berlin. The western allies had only two choices: either give up Berlin or supply it by airlift from the West German airports. An aircraft landed in Berlin every 90 seconds, whose pilots threw sweets from the cockpit. As such, these aircraft came to be known as ‘Rosinenbomber’. 
Ten West European countries, the USA, and Canada founded the NATO in 1949. With this alliance, the states agreed to support one another in times of war. The FRG entered this alliance in 1955.The East European counterpart of the NATO was the Warsaw Pact. Both the alliances started arming themselves and the cold war started.
After the Second World War, the four ‘Allies’ that fought against Germany – England, France, USA, and the Soviet Union (USSR) – divided Germany into four occupation zones. Berlin lay in the middle of the Soviet zone. Sharp differences of opinion between the three western powers and the Soviet Union led to the founding of the NATO in 1949 and the formation of two German states, the FRG and the GDR. The cold war began with the enemies constantly threatening the use of atomic weapons. Soon, the GDR was blocked out for the West with a border fence and the Berlin wall. The change of events came at the end of the 1980s. The cold war ended, the two German nations got unified, and the USSR split.
Yes, people protested against him at various points in time. A few hid the opponents of the regime and the Jews from the authorities. Groups like the ‘White Rose’ by The Scholl siblings distributed handouts and asked the people to revolt against the Nazi regime. Businessmen like Oscar Schindler employed the CC detainees in their factories in order to protect them from the death camps. High military officials attempted to assassinate Hitler but without success. Workers in the arms factories intentionally produced defective weapons, and there were revolts in ghettos and concentration camps. In addition, in the occupied territories, the armed groups fought underground. However, most of the people remained inactive out of fear because whosoever was betrayed or discovered had to pay the price with his life.
After acquiring power, Hitler started preparing for expanding his territory to the east. This happened on September 1, 1939. The German armed forces attacked Poland and the Second World War started. Till 1941, the Germans fought together with Italy and Japan against France, Great Britain, USA, and the Soviet Union. The war was waged outside Europe as well. Unlike previous wars, the civil population also suffered mainly from the constant air raids. The war ended in Europe on May 8, 1945, with the surrender of Germany.[custom_search_and_filter]