Which event occured last in world war 2

Militarily, as far as i know, it was the detonation of two nuclear atom bombs on the cities of Hiroshima and Nagasaki In Japan (the only country to have the power of a nuclear weapon used against it in combat). After the bombing of those two cities, killing millions of people, Japan was i believe the last of the Axis powers to surrender on the 15th of August, 1945. Then after that, politically anyways, Japanese Prime minister Mamoru Shigemitsu officially signed the document on September 2, thus officially ending WW2.