Editing 1850 (section)

=== April&ndash;June ===
* [[April 4]] &ndash; [[Los Angeles]] is incorporated as a city in California.
* [[April 15]]
** [[San Francisco]] is incorporated as a city in California.
** [[Angers Bridge]] collapses in France killing around 226 of the soldiers crossing it at the time.
* [[April 19]] &ndash; The [[Clayton–Bulwer Treaty]] is signed by the United States and Great Britain, allowing both countries to share Nicaragua, and not claim complete control over the proposed [[Nicaragua Canal]].
* [[April]]
** [[Pope Pius IX]] returns from exile to Rome.
** [[Stephen Foster]]'s parlor ballad "[[Ah! May the Red Rose Live Alway]]" is published in the United States.
* [[May 15]] &ndash; The [[Bloody Island Massacre]] takes place at Clear Lake in northern California.
* [[May 23]] &ndash; The {{USS|Advance|1847|6}} puts to sea from New York to search for [[Franklin's lost expedition]] in the Arctic.
* [[May 25]] &ndash; The [[hippopotamus]] [[Obaysch]] arrives at [[London Zoo]] from [[Egypt]], the first seen in Europe since Roman times.
* [[June 1]] 
** The [[Convict era of Western Australia|transportation of British convicts to Western Australia]] begins, as the transportation of British convicts to other parts of Australia is phased out, when the ship ''Scindian'' arrives in [[Fremantle]], with 75 male prisoners.
** The [[postage stamp]] issues of Austria begin with a series of [[imperforate]] typographed stamps, featuring the coat of arms.
** The [[1850 United States census]] shows that 11.2% of the population classed as "Negro" are of mixed race.
* [[June 3]] &ndash; [[Kansas City, Missouri]], is incorporated by [[Jackson County, Missouri]], as the ''Town of Kansas'' (traditional date of its founding).