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.
Because romanticism emphasized intuition, feelings, individual acts of heroism, and the study of nature whereas the age of reason emphasized balance, order, and reason.
Interestingly enough, the world did not see an increase in the number of hijackings after 9/11, which possibly could be credited to increased security measures.
