Editing 1820 (section)

=== July–September ===
*[[July 13]] – A revolt under [[Guglielmo Pepe]] forces [[Ferdinand I of the Two Sicilies]] to sign a constitution modeled on the [[Spanish Constitution of 1812]].<ref name="Ewald1868"/>
*[[July 20]] – [[Saint Cronan's Boys' National School]] opens in [[Bray, County Wicklow]], [[Republic of Ireland|Ireland]] under the title ''Bray Male School''. Its notable pupils will include [[President of Ireland]] [[Cearbhall Ó Dálaigh]].
*[[July 26]] – [[Union Bridge (Tweed)|Union Chain Bridge]] opens across the [[River Tweed]], between England and Scotland. Its span of 449&nbsp;ft (137 m) is the world's longest for a vehicular bridge at this time.<ref>{{cite book|url=https://archive.org/details/amemoirsuspensi01drewgoog|title=A Memoir of Suspension Bridges: Comprising The History Of Their Origin And Progress|chapter=Section III|last=Drewry|first=Charles Stewart|year=1832|publisher=Longman, Rees, Orme, Brown, Green & Longman|location=London|pages=[https://archive.org/details/amemoirsuspensi01drewgoog/page/n55 37]–41|access-date=August 16, 2011}}</ref>
*[[August 1]] — The [[Regent's Canal]] through to the [[London Docks]] is opened.
*[[August 24]] – A [[Constitutionalist]] insurrection breaks out at [[Porto|Oporto]], [[History of Portugal#Crises of the nineteenth century|Portugal]].
*[[September 2]] – The [[Daoguang Emperor]] succeeds to the throne of [[Qing dynasty]] China.
*[[September 5]] – [[José Gervasio Artigas]] flees to [[Paraguay]]. 
*[[September 15]] – Revolution breaks out in [[Lisbon]] against [[John VI of Portugal]].<ref>{{cite book |author1=[[Matthew Anthony Fitzsimons]] |url=https://books.google.com/books?id=h6IwAQAAIAAJ |title=The Catholic Church Today: Western Europe |author2=Jean Bécarud |publisher=University of Notre Dame Press |year=1969 |isbn=978-0-268-00307-4 |page=162}}</ref>
[[File:Chicago in 1820.jpg|thumb|right|[[Chicago]] in 1820]]