Fifty-four years ago today, on September 3, 1971 (July 14, 1971 in the lunar calendar), the agreement on West Berlin was signed. On March 6, 1970, the Soviet Union, the United States, Britain and France held negotiations on the Berlin issue. The agreement on West Berlin, known as the West Berlin Agreement, was signed on September 3, 1971. The main contents are: reaffirming the rights and responsibilities of the United States, Britain and France in West Berlin; The transit traffic of civilians and goods from western countries through the West Berlin Passage will be unimpeded; West Berlin is not an integral part of the Federal Republic of Germany, and it will not be under the jurisdiction of the Federal Republic of Germany in the future; The people of West Berlin can visit the Democratic Republic of Germany for humanitarian, family, religious and commercial reasons or as travelers; The Federal Republic of Germany may represent the interests of West Berlin in international organizations and international conferences. After the agreement was signed, the situation in Berlin became stable.