From Division to Reunification

John F. Kennedy, West Berlin, June 26, 1963. Photo from csumc.wisc.edu/.../writings/2_
myths_kennedy.html (click photo to see part of speech)
"Febuary 4, 1945: Yalta Conference starts.
Febuary 11, 1945: Yalta Conference ends.
May 8, 1945: World War II is over and Berlin is divided into 4 sectors: the American, British, French in the West and the Soviet in the East.
July 17, 1945: Potsdam Conference Starts.
August 2, 1945: Potsdam Proclamation agreed upon.
October 29, 1946: A 30 day valid Interzonenpass is required to travel between the sectors in Germany.
June 25, 1948: Berlin Airlift begins.
May 24, 1949: Federal Republic of Germany is founded (West Germany).
September 30, 1949: Berlin Airlift ends.
October 7, 1949: German Democratic Republic is founded (East Germany).
May 26, 1952: Border between East and West Germany and between East Germany and West Berlin is closed. Only the border between East and West Berlin is still opened.
November 14, 1953: The Western powers waive the Interzonenpass, the Soviet Union follows but East German citizen need a permission to travel to the West.
December 11, 1957: Leaving East Germany without permission is forbidden and violations are prosecuted with prison up to three years.
August 13, 1961: The Berlin sectorial border between East and West Berlin is closed, barriers are built.
August 14, 1961: Brandenburg Gate is closed.
August 26, 1961: All crossing points are closed for West Berlin citizens.
June 26, 1963: President J. F. Kennedy visits Berlin and proclaims: “Ich bin ein Berliner.” (“I am a Berliner.”)
December 17, 1963: West Berliner citizens may visit East Berlin the first time after more than two years.
June 12, 1987: President Ronald Reagan visits Berlin and urges Soviet leader Mikhail Gorbachev to tear down the Berlin Wall.
September 10, 1989: Hungarian government opens border for East German refugees.
November 9, 1989: Berlin Wall is opened.
December 22, 1989: Brandenburg Gate is opened.
October 3, 1990: Germany is reunited."
(http://www.dailysoft.com/berlinwall/history/berlinwall-timeline.htm)