From 1945 to 1990, the divided Germany began with the Berlin Declaration, marking the abolition of the German Reich and Allied-occupied period in Germany on 5 June 1945, and ended with the German reunification on 3 October 1990.
Following the collapse of the Third Reich in 1945 and its defeat in World War II, Germany was stripped of its territorial gains. Beyond that, more than a quarter of its old pre-war territory was annexed by communist Poland and the Soviet Union. The German populations of these areas were expelled to the west. Saarland was a French protectorate from 1947 to 1956 without the recognition of the "Four Powers", because the Soviet Union opposed it, making it a disputed territory.
At the end of World War II, there were some eight million foreign displaced people in Germany, mainly forced laborers and prisoners. This included around 400,000 survivors of the Nazi concentration camp system, where many times more had died from starvation, harsh conditions, murder, or being worked to death. Between 1944 and 1950, some 12 to 14 million German-speaking refugees and expellees arrived in Western and central Germany from the former eastern territories and other countries in Eastern Europe; an estimated two million of them died on the way there. Some nine million Germans were prisoners of war.
With the beginning of the Cold War, the remaining territory of Germany was divided between the Western Bloc led by the United States, and the Eastern Bloc led by the USSR. Two separate German countries emerged:
Under Chancellor Konrad Adenauer, West Germany built strong relationships with France, the United Kingdom, the United States, and Israel. West Germany also joined the North Atlantic Treaty Organization and the European Economic Community. East Germany's economy, centrally planned in the Soviet style, grew increasingly stagnant; the East German secret police tightly controlled daily life, and the Berlin Wall (1961) ended the steady flow of refugees to the West. The country was reunited on 3 October 1990, following the decline and fall of the SED as the ruling party of East Germany and the Peaceful Revolution there.
Division of Germany
Four military occupied zones
At the Potsdam Conference (17 July to 2 August 1945), after Germany's unconditional surrender on 8 May 1945, the Allies officially divided Germany into the four military occupation zones — France in the southwest, the United Kingdom in the northwest, the United States in the south, and the Soviet Union in the east, bounded on the east by the new Poland-Germany border on the Oder-Neisse line. At Potsdam, these four zones in total were denoted as 'Germany as a whole', and the four Allied Powers exercised the sovereign authority they now claimed over Germany in agreeing 'in principle' to the ceding of territory of the former German Reich east of 'Germany as a whole' to Poland and the Soviet Union.
In addition, under the Allies' Berlin Declaration (1945), the territory of the extinguished German Reich was to be treated as the land area within its borders as of 31 December 1937. All land expansion from 1938 to 1945 was hence treated as automatically invalid, including Eupen-Malmedy, Alsace-Lorraine, Austria, Lower Styria, Upper Carniola, Southern Carinthia, Bohemia, Moravia, Czech Silesia, Danzig, Poland, and Memel.
Flight and expulsion of ethnic Germans
The northern half of East Prussia in the region of Königsberg was administratively assigned by the Potsdam Agreement to the Soviet Union, pending a final Peace Conference (with the commitment of Britain and the United States to support its incorporation into Russia); and was then annexed by the Soviet Union. The Free City of Danzig and the southern half of East Prussia were incorporated into and annexed by Poland; the Allies having assured the Polish government-in-exile of their support for this after the Tehran Conference in 1943. It was also agreed at Potsdam that Poland would receive all German lands East of the Oder-Neisse line, although the exact delimitation of the boundary was left to be resolved at an eventual Peace Conference. Under the wartime alliances of the United Kingdom with the Czechoslovak and Polish governments-in-exile, the British had agreed in July 1942 to support "the General Principle of the transfer to Germany of German minorities in Central and South Eastern Europe after the war in cases where this seems necessary and desirable". In 1944 roughly 12.4 million ethnic Germans were living in territory that became part of post-war Poland and Soviet Union. Approximately 6 million fled or were evacuated before the Red Army occupied the area. Of the remainder, around 2 million died during the war or in its aftermath (1.4 million as military casualties; 600,000 as civilian deaths), 3.6 million were expelled by the Poles, one million declared themselves to be Poles, and 300,000 remained in Poland as Germans. The Sudetenland territories, surrendered to Germany by the Munich Agreement, were returned to Czechoslovakia; these territories containing a further 3 million ethnic Germans. 'Wild' expulsions from Czechoslovakia began immediately after the German surrender.
The Potsdam Conference subsequently sanctioned the "orderly and humane" transfer to Germany of individuals regarded as "ethnic Germans" by authorities in Czechoslovakia, Poland, and Hungary. The Potsdam Agreement recognized that these expulsions were already underway and were putting a burden on authorities in the German Occupation Zones, including the re-defined Soviet Occupation Zone. Most of the Germans who were being expelled were from Czechoslovakia and Poland, which included most of the territory to the east of the Oder-Neisse Line. The Potsdam Declaration stated:
Since the influx of a large number of Germans into Germany would increase the burden already resting on the occupying authorities, they consider that the Allied Control Council in Germany should in the first instance examine the problem with special regard to the question of the equitable distribution of these Germans among the several zones of occupation. They are accordingly instructing their respective representatives on the control council to report to their Governments as soon as possible the extent to which such persons have already entered Germany from Poland, Czechoslovakia, and Hungary, and to submit an estimate of the time and rate at which further transfers could be carried out, having regard to the present situation in Germany. The Czechoslovak Government, the Polish Provisional Government and the control council in Hungary are at the same time being informed of the above and are being requested meanwhile to suspend further expulsions pending the examination by the Governments concerned of the report from their representatives on the control council.
Many of the ethnic Germans, who were primarily women and children, and especially those under the control of Polish and Czechoslovak authorities, were severely mistreated before they were ultimately deported to Germany. Thousands died in forced labor camps such as Lambinowice, Zgoda labour camp, Central Labour Camp Potulice, Central Labour Camp Jaworzno, Glaz, Milecin, Gronowo, and Sikawa. Others starved, died of disease, or froze to death while being expelled in slow and ill-equipped trains; or in transit camps.
Altogether, around 8 million ethnic German refugees and expellees from across Europe eventually settled in West Germany, with a further 3 million in East Germany. In West Germany these represented a major voting block; maintaining a strong culture of grievance and victimhood against Soviet Power, pressing for a continued commitment to full German reunification, claiming compensation, pursuing the right of return to lost property in the East, and opposing any recognition of the postwar extension of Poland and the Soviet Union into former German lands. This block eventually became substantially aligned with the Christian Democratic Union of Germany; although in practice 'westward-looking' CDU policies favouring the Atlantic Alliance and the European Union worked against the possibility of achieving the objectives of the expellee population from the east through negotiation with the Soviet Union. But for Adenauer, fostering and encouraging unrealistic demands and uncompromising expectations amongst the expellees would serve his "Policy of Strength" by which West Germany contrived to inhibit consideration of unification or a final Peace Treaty until the West was strong enough to face the Soviets on equal terms. Consequently, the Federal Republic in the 1950s adopted much of the symbolism of expellee groups; especially in appropriating and subverting the terminology and imagery of the Holocaust; applying this to post-war German experience instead. Eventually in 1990, following the Treaty on the Final Settlement With Respect to Germany, the unified Germany indeed confirmed in treaties with Poland and the Soviet Union that the transfer of sovereignty over the former German eastern territories in 1945 had been permanent and irreversible; Germany now undertaking never again to make territorial claims in respect of these lands.
The intended governing body of Germany was called the Allied Control Council, consisting of the commanders-in-chief in Germany of the United States, the United Kingdom, France and the Soviet Union; who exercised supreme authority in their respective zones, while supposedly acting in concert on questions affecting the whole country. In actuality however, the French consistently blocked any progress towards re-establishing all-German governing institutions; substantially in pursuit of French aspirations for a dismembered Germany, but also as a response to the exclusion of France from the Yalta and Potsdam conferences. Berlin, which lay in the Soviet (eastern) sector, was also divided into four sectors with the Western sectors later becoming West Berlin and the Soviet sector becoming East Berlin.
Elimination of war potential and reparations
Denazification
A key item in the occupiers' agenda was denazification. The swastika and other outward symbols of the Nazi regime were banned, and a Provisional Civil Ensign was established as a temporary German flag. It remained the official flag of the country (necessary for reasons of international law) until East Germany and West Germany (see below) were independently established in 1949.
The United States, the United Kingdom, and the Soviet Union had agreed at Potsdam to a broad program of decentralization, treating Germany as a single economic unit with some central administrative departments. These plans never materialized, initially because France blocked any establishment of central administrative or political structures for Germany; and also as both the Soviet Union and France were intent on extracting as much material benefit as possible from their occupation zones in order to make good in part the enormous destruction caused by the German Wehrmacht; and the policy broke down completely in 1948 when the Russians blockaded West Berlin and the Cold War began. It was agreed at Potsdam that the leading members of the Nazi regime who had been captured should be put on trial accused of crimes against humanity, and this was one of the few points on which the four powers were able to agree. In order to secure the presence of the western allies in Berlin, the United States agreed to withdraw from Thuringia and Saxony in exchange for the division of Berlin into four sectors.
Future President and General Dwight D. Eisenhower and the US War Department initially implemented a strict non-fraternization policy between the US troops and German citizens. The State Department and individual US congressmen pressured to have this policy lifted. In June 1945 the prohibition against speaking with German children was loosened. In July troops were permitted to speak to German adults in certain circumstances. In September 1945 the entire policy was dropped. Only the ban on marriage between Americans and German or Austrian civilians remained in place until 11 December 1946 and 2 January 1946 respectively.
Industrial disarmament in West Germany
The initial proposal for the post-surrender policy of the Western powers, the so-called Morgenthau Plan proposed by Henry Morgenthau Jr., was one of "pastoralization". The Morgenthau Plan, though subsequently ostensibly shelved due to public opposition, influenced occupation policy; most notably through the U.S. punitive occupation directive JCS 1067 and the industrial plans for Germany.
The "Level of Industry plans for Germany" were the plans to lower German industrial potential after World War II. At the Potsdam Conference, with the U.S. operating under influence of the Morgenthau plan, the victorious Allies decided to abolish the German armed forces as well as all munitions factories and civilian industries that could support them. This included the destruction of all ship and aircraft manufacturing capability. Further, it was decided that civilian industries which might have a military potential, which in the modern era of "total war" included virtually all, were to be severely restricted. The restriction of the latter was set to Germany's "approved peacetime needs", which were defined to be set on the average European standard. In order to achieve this, each type of industry was subsequently reviewed to see how many factories Germany required under these minimum level of industry requirements.