World War I
World War II.
the great depression
World War 1
world war ll
yes, very It is very significant event because basically the whole world has been involved. And it says WORLD war so it must be important to everyone.
World War One started.
It was the assasination of archduke franz Ferdinand that directly started world war 1
Japan's attack on Pearl Harbor,and Americans reply as atomic bombs was the most important event
it is remembered by a ceramony
The German invasion of Poland on 1 September 1939
The German invasion of Poland on 1 September 1939