German reunification
Final settlement

The victors of World War II—France, the Soviet Union, the United Kingdom, and the United States, comprising the Four-Power Authorities —retained authority over Berlin, such as control over air travel and its political status. From the onset, the Soviet Union sought to use reunification as a way to push Germany out of NATO into neutrality, removing nuclear weapons from its territory. However, West Germany misinterpreted a 21 November 1989 diplomatic message on the topic to mean that the Soviet leadership already anticipated reunification only two weeks after the Wall's collapse. This belief, and the worry that his rival Genscher might act first, encouraged Kohl on 28 November to announce a detailed "Ten Point Program for Overcoming the Division of Germany and Europe ". While his speech was very popular within West Germany, it caused concern among other European governments, with whom he had not discussed the plan.

The Americans did not share the Europeans' and Soviets' historical fears over German expansionism; Condoleezza Rice later recalled,

The United States—and President George H. W. Bush —recognized that Germany went through a long democratic transition. It was a good friend, it was a member of NATO. Any issues that existed in 1945, it seemed perfectly reasonable to lay them to rest. For us, the question wasn't should Germany unify? It was how and under what circumstances? We had no concern about a resurgent Germany...

The United States wished to ensure, however, that Germany would stay within NATO. In December 1989, the administration of President George H. W. Bush made a united Germany's continued NATO membership a requirement for supporting reunification. Kohl agreed, although less than 20 percent of West Germans supported remaining within NATO. Kohl also wished to avoid a neutral Germany, as he believed that would destroy NATO, cause the United States and Canada to leave Europe, and cause Britain and France to form an anti-German alliance. The United States increased its support of Kohl's policies, as it feared that otherwise Oskar Lafontaine, a critic of NATO, might become Chancellor. Horst Teltschik, Kohl's foreign policy advisor, later recalled that Germany would have paid "100 billion deutschmarks" if the Soviets demanded it. The USSR did not make such great demands, however, with Gorbachev stating in February 1990 that "he Germans must decide for themselves what path they choose to follow". In May 1990, he repeated his remark in the context of NATO membership while meeting Bush, amazing both the Americans and Germans. This removed the last significant roadblock to Germany being free to choose its international alignments, though Kohl made no secret that he intended for the reunified Germany to inherit West Germany's seats in NATO and the EC.

During a NATO–Warsaw Pact conference in Ottawa, Canada; Genscher persuaded the four powers to treat the two Germanies as equals instead of defeated junior partners and for the six nations to negotiate alone. Although the Dutch, Italians, Spanish, and other NATO powers opposed such a structure, which meant that the alliance's boundaries would change without their participation, the six nations began negotiations in March 1990. After Gorbachev's May agreement on German NATO membership, the Soviets further agreed that Germany would be treated as an ordinary NATO country, with the exception that former East German territory would not have foreign NATO troops or nuclear weapons. In exchange, Kohl agreed to reduce the sizes of the militaries of both West and East Germany, renounce weapons of mass destruction, and accept the postwar Oder–Neisse line as Germany's eastern border. In addition, Germany agreed to pay about 55 billion deutschmarks to the Soviet Union in gifts and loans, the equivalent of eight days of the West German GDP. To oppose German reunification, the British insisted to the end, against Soviet opposition, that NATO be allowed to hold maneuvers in the former East Germany. Thatcher later wrote that her opposition to reunification had been an "unambiguous failure".
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