Editing 1846 (section)

=== April–June ===
* [[April 25]] – [[Mexican–American War]]: Open conflict begins, over the disputed border of [[Texas]].
* [[May]] – The [[Associated Press]] is founded in New York.
* [[May 8]] – [[Mexican–American War]] – [[Battle of Palo Alto]]: [[Zachary Taylor]] defeats a Mexican force north of the [[Rio Grande]] at [[Palo Alto, Texas]] in the first major battle of the war.
* [[May 11]] – The [[University at Buffalo]] is founded by future United States Vice President and President, [[Millard Fillmore]].<ref>{{cite web|url=http://library.buffalo.edu/archives/ubhistory/presidents.html|title=Chancellors and Presidents of the University|access-date=2016-12-06|publisher=University of Buffalo, The State University of New York|archive-url=https://web.archive.org/web/20160610165345/http://library.buffalo.edu/archives/ubhistory/presidents.html|archive-date=June 10, 2016|url-status=dead|df=mdy-all}}</ref>
* [[May 13]] – [[Mexican–American War]]: The United States declares war on Mexico.
* [[May 15]] – Under the leadership of [[Prime Minister of the United Kingdom|Prime Minister]] [[Robert Peel]], the [[House of Commons of the United Kingdom]] votes to repeal the [[Corn Laws]] by passing an Importation Bill, replacing the old [[Colonialism|colonial]] mercantile trade system with [[free trade]]<ref name="Icons">{{cite web|url=http://www.icons.org.uk/theicons/icons-timeline/1840-1860|title=Icons, a portrait of England 1840–1860|access-date=2007-09-13|archive-url=https://web.archive.org/web/20070817165102/http://www.icons.org.uk/theicons/icons-timeline/1840-1860 |archive-date=August 17, 2007|url-status=dead}}</ref> in response to the [[Great Famine (Ireland)]]. On June 25 the [[Duke of Wellington]] persuades the [[House of Lords]] to pass the Act, which will take full effect from February [[1849]]. Peel, however, is forced to resign.
* [[May 16]] – The [[Revolution of Maria da Fonte]] begins in Portugal. It will be by royalist troops on [[February 22]], [[1847]].
* [[June 10]] – [[Mexican–American War]]: The [[California Republic]] declares independence from Mexico.
* [[June 14]] – [[Bear Flag Revolt]]: American settlers in [[Sonoma, California]], start a rebellion against Mexico and proclaim the [[California Republic]].
* [[June 15]]
** The [[Oregon Treaty]] establishes the [[49th parallel north|49th parallel]] as the border between the United States and Canada, from the [[Rocky Mountains]] to the [[Strait of Juan de Fuca]].
** [[Launceston Church Grammar School]] opens for the first time in [[Tasmania]].
* [[June 16]] – [[Pope Pius IX]] succeeds [[Pope Gregory XVI]] as the 255th [[pope]]. He will reign for 31½ years (the longest definitely confirmed).
* [[June 28]] – The [[saxophone]] is [[patent]]ed by [[Adolphe Sax]].<ref>{{cite magazine|first=Hugh|last=Hart|title=June 28, 1846: Parisian Inventor Patents Saxophone|url=https://www.wired.com/thisdayintech/2010/06/0628saxophone-patent|magazine=Wired|date=2010-06-28|access-date=2011-12-07}}</ref>