Dec. 17 After much negotiation, an agreement is reached allowing West Berliners to visit relatives in East Berlin on a limited basis.
East German authorities order stricter border controls – with additional wall segments and barbed wire to foil escapes – after negotiations for freer crossings break down.
Sept. 3 The Four-Power Agreement on Berlin was signed. The accord led to eased travel restrictions from West Germany to West Berlin as well as an opening of trade and diplomatic ties between East Germany and West Germany
A second wall is built behind the original wall deeper inside East German territory, including touch-sensitive fencing with weapons mounted to fire at anyone touching the fence.
Oct. 7 Three teenagers are killed when East German police clash with protesters demanding "Down with the wall!"
Aug. 31 An escalation of Eastern European reform movements, begun in the 1970s, culminates in an agreement between the Communist Polish government and striking Gdansk shipyard workers led by electrician Lech Walesa. The workers ended their strike and the government guaranteed the workers' right to form independent trade unions as well as to strike. This leads to the rise of the anticommunist Solidarity movement.
June 12 Speaking in West Berlin at the wall, US President Ronald Reagan says : "General Secretary Gorbachev, if you seek peace, if you seek prosperity for the Soviet Union and Eastern Europe, if you seek liberalization: Come here to this gate. Mr. Gorbachev, open this gate. Mr. Gorbachev, tear down this wall."