Editing 1848 (section)

=== July–September ===
[[File:1948matalerebellion.JPG|thumb|[[July 26]]: [[Matale Rebellion]] begins in [[Sri Lanka]].]]
[[File:Gedenkblatt 1874.jpg|thumb|[[September 12]]: The [[Swiss Confederation]] reconstitutes itself as a [[federal republic]].]]
* [[July]] – The [[Public Health Act 1848|Public Health Act]] establishes [[Local board of health|Boards of Health]] across [[England and Wales]], the nation's first public health law, giving cities broad authority to build modern sanitary systems.<ref name=CBH>{{cite book|last=Palmer|first=Alan|last2=Palmer |first2=Veronica|year=1992|title=The Chronology of British History|publisher=Century Ltd|location=London|pages=269–270|isbn=0-7126-5616-2}}</ref>
* [[July 3]] – Governor-General [[Peter von Scholten]] emancipates all remaining slaves in the [[Danish West Indies]] 
* [[July 5]] – The Hungarian national revolutionary [[parliament]] starts to work.
* [[July 11]] – [[Waterloo station|Waterloo]] railway station in London opens.
* [[July 19]] – [[Seneca Falls Convention]]: The 2-day [[women's rights]] convention opens in [[Seneca Falls, New York]]; "[[Bloomers (clothing)|Bloomers]]" are introduced.
* [[July 26]]
** The [[Matale Rebellion]] breaks out against [[British Ceylon|British rule]] in [[Sri Lanka]].
** The [[University of Wisconsin–Madison]] is founded.
* [[July 29]] – [[Young Irelander Rebellion of 1848|Young Irelander Rebellion]]: A nationalist revolt in [[County Tipperary]], against British rule, is put down by the [[Royal Irish Constabulary|Irish Constabulary]].<ref name=CBH/>
* [[August 6]] – [[HMS Daedalus (1826)|HMS ''Daedalus'']] reports a sighting of a sea serpent.
* [[August 14]] – American President [[James K. Polk]] annexes the [[Oregon Country]], and renames it the [[Oregon Territory]] as part of the United States.    
* [[August 17]] – The Independent [[Republic of Yucatán]] officially unites with Mexico, in exchange for Mexican help in suppressing a revolt by the indigenous [[Maya peoples|Maya]] population.
* [[August 19]] – [[California Gold Rush]]: The ''[[New York Herald]]'' breaks the news to the East Coast of the United States that there is a [[gold rush]] in [[California]] (although the rush started in January).
* [[August 24]] – The U.S. [[barque]] ''[[Ocean Monarch (barque)|Ocean Monarch]]'' is burnt out off the [[Great Orme]], [[North Wales]], with the loss of 178, chiefly emigrants.
* [[August 28]] – [[Louisy Mathieu]] becomes the first black member to join the [[French Parliament]], as a representative of [[Guadeloupe]].
* [[September 10]] – The Austrian commander [[Karl von Urban]] makes the first stand against the Revolution in Hungary, assembling in his headquarters in Năsăud hundreds of delegates from all districts of the [[Principality of Transylvania (1711–1867)|Principality of Transylvania]]. As a result, 918 communities in the region distance themselves from the Revolution.
* [[September 11]] – The [[Croatia]]n army of [[Josip Jelačić]], encouraged in secret by the [[Habsburg]] government, crosses the [[Drava]] River and attacks Hungary, with the goal of ending the revolution in that country.
* [[September 12]] – One of the successes of the [[Revolutions of 1848]], the [[Swiss Federal Constitution]], patterned on the [[Constitution of the United States]], enters into force, creating a [[federal republic]], and one of the first modern [[Democracy|democratic]] states in Europe.
* [[September 13]] – [[Vermont]] railroad worker [[Phineas Gage]] survives a 3-foot-plus iron rod being driven through his head.
* [[September 16]] – [[William Cranch Bond]] and [[William Lassell]] discover [[Hyperion (moon)|Hyperion]], [[Saturn]]'s [[natural satellite|moon]].
* [[September 25]] – The Hungarian king and [[Habsburg]] emperor [[Ferdinand I of Austria|Ferdinand V]] refuses to recognise the [[Hungarian government]], led by [[Lajos Batthyány]]. The Batthyány government resigns and the National Defence Committee is formed, which is a temporary crisis government, totally independent from Vienna, under the leadership of [[Lajos Kossuth]].
* [[September 26]] – The [[University of Ottawa]] is founded in Canada as the College of Bytown, a Roman Catholic institution.
* [[September 29]] – [[Battle of Pákozd]]: The Hungarian revolutionary army, led by János Móga, defeats the [[Croatia]]n army of [[Josip Jelačić]], forcing him to retreat towards [[Vienna]].