I presume you mean WW2 not 11, but i brought an end to the great depression
The atomic bombings of the Japanese cities of Hiroshima and Nagasaki .
End of World War 1
1920 -- Nov 11, 1918
World War 1 ended on November 11, 1918 at 11:00 am, when the Armistice was signed.
War World 11 never happend. World War II happened from 1939-1945.
If you are referring to World War 1, it was the Armistice on 11 November 1918.
The signing of the Armistice on November 11, 1918, ended World War I.
The Japanese attack on the US Naval base at Pearl Harbour (December 1941).
When: 11 November 1918 around 11:00AM. What: They stopped shooting.
On the 11th November at 11 AM as that was when it finished.
Truman was President at the end of WW2.
See: COLD WAR