During cold war which event occurred last

During 1989 and 1990, the Berlin Wall came down, borders opened, and free elections ousted Communist regimes everywhere in eastern Europe. In late 1991 the Soviet Union itself dissolved into its component republics. With stunning speed, the Iron Curtain was lifted and the Cold War came to an end.

Earliest first:

Berlin airlift April 1948 to May 1949

Launch of Sputnik October 1957

Cuban Missile Crisis October 1962

Destruction of the Berlin Wall November 1989.

The correct answer is "the protesters were attacked by chinese troops and many were killed or arrested."