The UN was started in 1945, just after World War II.
the european champions league
It was the assasination of archduke franz Ferdinand that directly started world war 1
Set the world record in the 100m dash portion of the race
Britain's colonization of a large portion of the world
The increased investment in European militaries
Knowing what "the event" is would help in answering the question.
Germany invaded Poland
The assassination of Franz Ferdinand
The assassination of Archduke Ferdinand
World War One started.
France