The dropping of two nuclear weapons on Hiroshima and Nagasaki ended World War II.
This caused Japan to surrender unconditionally on 2 September 1945
Sources: http://en.wikipedia.org/wiki/Surrender_of_Japan and http://en.wikipedia.org/wiki/1945
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There was not a specific single battle that ended WWII. Dropping the Atomic Bomb on Hiroshima and Nagasaki brought about Japanese surrender.
World War II ended on September 2, 1945.
The battle of Monte Cassino had a massive impact on world war II. If the Battle of the Monte Cassino didn't happen then world war II would have gone on for much longer.
WW II ended in the year 1945.
World War II.
The Battle of the Coral Sea. Although it was a tactical draw, the battle was a strategic win for the Allies because it stopped their drive toward Australia.