Editing 1930 (section)

===April===
{{Main|April 1930}}
* [[April 6]]
** In an act of [[civil disobedience]], [[Mahatma Gandhi]] breaks the [[History of the salt tax in British India|salt laws of British India]] by making salt by the sea at the end of the [[Salt March]].<ref>{{cite journal|last=Decourcy|first=Elisa|title=Just a grain of salt?: Symbolic construction during the Indian nationalist movement|journal=Melbourne Historical Journal|year=2010|volume=38|pages=57–72}}</ref>
** The [[Left Opposition|International Left Opposition]] (ILO) is founded in Paris, France.
* [[April 17]] – [[Neoprene]] is invented by [[DuPont]].
* [[April 18]] – The Chittagong Rebellion begins in India with the [[Chittagong armoury raid]]
* [[April 19]] - [[Football Association of Indonesia]] ([[PSSI]]) founded 
* [[April 21]]
** A fire in the [[Ohio Penitentiary]] in [[Columbus, Ohio|Columbus]], United States kills 320 people.<ref>{{Cite HGOC|page=133}}</ref>
** The [[Turkestan–Siberia Railway]] is completed.
* [[April 22]] – The United Kingdom, Japan and the United States sign the [[London Naval Treaty]] to regulate [[submarine warfare]] and limit naval shipbuilding.