Editing 1978 (section)

=== December ===
{{Main|December 1978}}
* [[December 4]] – [[Dianne Feinstein]] succeeds the murdered [[George Moscone]], to become the first woman mayor of [[San Francisco]]; she will remain in office until January 8, 1988.
* [[December 6]] – The [[Spanish Constitution of 1978|Spanish Constitution]] officially restores the country's democratic government.<ref>{{cite web |title=Spain starts a new post-Franco era - archive, 1978 |url=https://www.theguardian.com/world/from-the-archive-blog/2018/jun/01/spain-constitution-new-era-1978 |website=The Guardian |access-date=8 March 2022 |language=en |date=1 June 2018}}</ref>
* [[December 11]]
** [[Lufthansa heist]]: Six men rob a Lufthansa cargo facility in New York City's [[John F. Kennedy International Airport]].
** Two million demonstrate against the Shah in [[Iran]].
*[[December 15]] – ''[[Superman (1978 film)|Superman: The Movie]]'' is released in cinemas in the United States.
* [[December 16]]
** Train 87 from [[Nanjing]] to [[Xining]] collides with train 368 from [[Xi'an]] to [[Xuzhou]] near Yangzhuang railway station in China, killing 106, injuring 218.
** ''[[The Mystery of Mamo]]'' is released in cinemas in Japan.
* [[December 19]] – Former [[Prime Minister of India]] [[Indira Gandhi]] is arrested and jailed for a week for breach of privilege and contempt of parliament.
* [[December 22]]
** The pivotal Third Plenum of the 11th National Congress of the [[Chinese Communist Party]] is held in Beijing, with Deng Xiaoping reversing Mao-era policies to pursue a program for [[Chinese economic reform]].
** Chicago serial killer [[John Wayne Gacy]], who was subsequently convicted of the murder of 33 young men and boys committed between 1972 and 1978, is arrested.
** [[Argentina]] begins [[Operation Soberanía]] against [[Chile]], but Argentinian forces quickly withdraw.
* [[December 25]] – [[Vietnam]] launches a major offensive against the [[Khmer Rouge]] of [[Cambodia]].
* [[December 27]] – The [[Spanish Constitution of 1978|Constitution of Spain]] is approved in a referendum, officially ending 40 years of military [[dictatorship]].