1) Holocaust 1933-1945
2) WW ll 1939-1945
3) Attack on Pearl Harbor 1941
4) Warsaw Ghetto Uprising 1943
5) D-day 1944
6) Founding of the UN 1945
7) Assassination of Ghandi 1948
8) Formation of NATO 1949
9) China becoming communist 1949
10) Start of Korean War 1950-1953
11) Queen Elizabeth ll Coronation 1953
12) Vietnam War 1955-1975
(I just randomly chose events that are sort of significant to the world)