Editing 1913 (section)

=== September ===
{{Main|September 1913 (month)}}
[[Image:The Balkan boundaries after 1913.jpg|thumb|175px|The Balkan boundaries after 1913]]
* [[September 7]]&ndash;[[September 8|8]] &ndash; The Fourth Congress of the [[International Psychoanalytical Association]] (the last occasion on which [[Carl Jung]] and [[Sigmund Freud]] will meet) takes place in [[Munich]].
* [[September 9]]
** In Germany, [[BASF]] starts the world's first plant for the production of [[fertilizer]] based on the [[Haber process|Haber-Bosch process]], feeding in modern times about a third of the world's population.
** [[Imperial Russian Army]] pilot [[Pyotr Nesterov]] becomes the first person to [[Aerobatic maneuver|loop]] an airplane, flying a [[Nieuport IV]] [[monoplane]] over Syretzk Aerodrome near [[Kiev]], in the [[Russian Empire]].
** [[Helgoland Island air disaster]]: The first fatalities aboard a German [[airship]] occur, when the [[Imperial German Navy]] [[Zeppelin]] dirigible ''LZ&nbsp;14'' (naval designation ''L&nbsp;1'') is forced down into the [[North Sea]] off [[Heligoland]] during a [[thunderstorm]], killing 16 of the 22 men on board.
* [[September 10]] &ndash; [[Jean Sibelius]]'s tone poem ''[[Luonnotar (Sibelius)|Luonnotar]]'' is premiered in [[Gloucester Cathedral]], England, with soprano [[Aino Ackté]].
* [[September 17]] &ndash; In Chicago, the [[Anti-Defamation League]] of [[B'nai B'rith]] is founded, with [[Sigmund Livingston]] as its first president.
* [[September 23]] &ndash; French aviator [[Roland Garros (aviator)|Roland Garros]] crosses the Mediterranean in an airplane flying from [[Fréjus]], France to [[Bizerte]], Tunisia.
* [[September 29]] &ndash; [[Second Balkan War]]: The [[Treaty of Constantinople (1913)|Treaty of Constantinople]] is signed in [[Istanbul]], between the [[Ottoman Empire]] and the [[Kingdom of Bulgaria]].