After the end of the Second World War in Europe (1939-1945) and the decisions of previous conferences in Tehran, Casablanca and Yalta, the Allies had taken the highest authority over Germany by the Berlin Declaration of 5 June 1945. At the conference of the three powers in Berlin (formal title of the Potsdam Conference) from 17 July to 2 August 1945, they approved and adopted the amstbiss of 1 August 1945. The signatories were Secretary General Joseph Stalin, President Harry S. Truman and Prime Minister Clement Attlee, who had replaced Winston Churchill as the United Kingdom`s representative following the 1945 British general election. The three powers also agreed to invite France and China to participate, as members of the Council of Foreign Ministers, which was established for the agreement. The provisional government of the French Republic accepted the invitation on 7 August, with the main caveat that it would not accept from the outset any obligation to form a central government in Germany. The agreement, which was a communiqué, was not a peace treaty between the peoples, although it created the fait accompli. It was replaced by the Treaty on the Definitive Regime, signed on 12 September 1990, in accordance with Germany. Although the treaty was signed by West and East Germany as separate sovereign states, it was then ratified by unified Germany (Federal Republic of Germany). Several developments in 1989 and 1990, collectively known as The Turning Point and the Peaceful Revolution, led to the fall of the Berlin Wall and the collapse of the SED in the GDR or GDR. During the elections to the National Council in the GDR on 18 March 1990 an electoral alliance of parties, which promoted German reunification by Article 23 of the Basic Law for the Federal Republic of Germany obtained a majority.
:229-232:211-214 In order to achieve unity and full sovereignty, the two German states were ready to accept the terms of the Potsdam Agreement on Germany.  On 31 August 1990, the FRG and the GDR signed the Unification Treaty, which describes the nature and modalities of the GDR`s accession to the FRG. Then all the international parties were able to negotiate a final settlement.  The treaty allows Germany to form alliances and be part of them, without foreign influence in its policy. All Soviet troops were to leave Germany by the end of 1994. Before the Soviets withdrew, Germany used only territorial defence units that were not integrated into the alliance structures. German troops in the rest of Germany were deployed to areas where Soviet troops were stationed. After the withdrawal of the Soviets, the Germans, with the exception of nuclear weapons, could freely send troops to these areas. During the Soviet presence, Allied troops remained stationed in Berlin at Germany`s request.  According to the Basic Law, the principle of freedom applies when entering into a contract. This principle refers to the fact that any party can decide with whom to sign a contract as long as it does not affect third parties.