Editing August 21 (section)

===1601–1900===
*[[1680]] &ndash; [[Puebloan peoples|Pueblo Indians]] capture [[Santa Fe, New Mexico|Santa Fe]] from the Spanish during the [[Pueblo Revolt]].
*[[1689]] &ndash; The [[Battle of Dunkeld]] in Scotland.<ref name=BTL32>{{Historic Environment Scotland|num=BTL32|desc=Battle of Dunkeld|access-date=19 June 2020}}</ref>
*[[1716]] &ndash; [[Seventh Ottoman–Venetian War]]: The arrival of naval reinforcements and the news of the [[Battle of Petrovaradin]] force the [[Ottoman Empire|Ottomans]] to abandon the [[Siege of Corfu (1716)|Siege of Corfu]], thus preserving the [[Ionian Islands]] under [[Republic of Venice|Venetian rule]].<ref>{{cite book | last=Chasiotis | first=Ioannis | chapter = Η κάμψη της Οθωμανικής δυνάμεως |trans-chapter=The decline of Ottoman power | pages = 8–51 | script-title=el:Ιστορία του Ελληνικού Έθνους, Τόμος ΙΑ′: Ο ελληνισμός υπό ξένη κυριαρχία, 1669–1821 |trans-title=History of the Greek Nation, Volume XI: Hellenism under foreign rule, 1669–1821 | location = Athens | year = 1975 | publisher = Ekdotiki Athinon | language = el}}</ref>
*[[1770]] &ndash; [[James Cook]] formally claims eastern Australia for [[Kingdom of Great Britain|Great Britain]], naming it [[New South Wales]].
*[[1772]] &ndash; King [[Gustav III of Sweden|Gustav III]] completes his [[coup d'état]] by adopting a new [[Swedish Constitution of 1772|Constitution]], ending [[Age of Liberty|half a century of parliamentary rule]] in Sweden and installing himself as an [[Enlightened absolutism|enlightened despot]].
*[[1778]] &ndash; [[American Revolutionary War]]: British forces [[Siege of Pondicherry (1778)|begin besieging]] the French outpost at [[Puducherry (union territory)|Pondichéry]].
*[[1791]] &ndash; A [[Bois Caïman|Vodou ceremony]], led by [[Dutty Boukman]], turns into a violent slave rebellion, beginning the [[Haitian Revolution]].
*[[1808]] &ndash; [[Battle of Vimeiro]]: [[United Kingdom of Great Britain and Ireland|British]] and [[Portuguese people|Portuguese]] forces led by General [[Arthur Wellesley, 1st Duke of Wellington|Arthur Wellesley]] defeat [[French Armed Forces|French]] force under Major-General [[Jean-Andoche Junot]] near the village of [[Vimeiro]], Portugal, the first Anglo-Portuguese victory of the [[Peninsular War]].
*[[1810]] &ndash; [[Charles XIV John of Sweden|Jean-Baptiste Bernadotte]], [[Marshal of France]], is elected [[Crown prince|Crown Prince]] of Sweden by the Swedish [[Riksdag of the Estates]].
*[[1821]] &ndash; [[Jarvis Island]] is discovered by the crew of the ship, ''Eliza Frances''.
*[[1831]] &ndash; [[Nat Turner]] leads black slaves and free blacks in [[Nat Turner's slave rebellion|a rebellion]] in [[Southampton County, Virginia]], which will claim the lives of 55 to 65 whites and about twice that number of blacks.<ref>{{cite web|website=This Day in Alternate History|title=August 21, 1831 – Nat Turner Begins his Slave Exodus|url=http://thisdayinalternatehistory.blogspot.com/2010/08/august-21-1831-nat-turner-begins-his.html|date=August 21, 2010|access-date=July 29, 2019}}</ref>
*[[1852]] &ndash; [[Tlingit|Tlingit Indians]] destroy [[Fort Selkirk]], [[Yukon Territory]].
*[[1858]] &ndash; The first of the [[Lincoln–Douglas debates]] is held in [[Ottawa, Illinois]].<ref>[https://www.nps.gov/liho/learn/historyculture/debate1.htm "First Debate: Ottawa, Illinois."] ''NPS.gov''.  21 August 2019.</ref>
*[[1862]] &ndash; The [[Stadtpark, Vienna|Stadtpark]], the first public park in [[Vienna]], opens to the public.<ref>{{Cite web |title=Stadtpark |url=https://www.wien.gv.at/english/environment/parks/stadtpark.html |access-date=20 August 2022 |website=City of Vienna}}</ref>
*[[1863]] &ndash; [[Lawrence, Kansas]] is [[Lawrence massacre|destroyed]] by [[Confederate States of America|pro-Confederate guerrillas]] known as [[Quantrill's Raiders]].
*[[1878]] &ndash; The [[American Bar Association]] is founded in [[Saratoga Springs]], [[New York (state)|New York]].<ref>{{Cite web |last1=Kaplan |first1=Howard |last2=Middleton |first2=Tiffany Willey |title=ABA Timeline |url=https://www.americanbar.org/about_the_aba/timeline/ |access-date=20 August 2022 |website=[[American Bar Association]]}}</ref>
*[[1879]] &ndash; The locals of [[Knock, County Mayo]], [[Ireland]] [[Knock Shrine#Apparition|report their having seen an apparition]] of the [[Mary, mother of Jesus|Virgin Mary]]. The apparition is later named [[Knock Shrine|“Our Lady of Knock”]] and the spot transformed into a [[Catholic Church|Catholic]] pilgrimage site.<ref>{{Cite web |title=History {{!}} Knock Shrine |url=https://www.knockshrine.ie/history/ |access-date=20 August 2022 |website=Knock Shrine: Ireland's International Eucharistic and Marian Shrine}}</ref>
*[[1883]] &ndash; [[1883 Rochester tornado|An F5 tornado]] strikes [[Rochester, Minnesota]], leading to the creation of the [[Mayo Clinic]].
*[[1888]] &ndash; The first successful [[adding machine]] in the United States is patented by [[William Seward Burroughs I|William Seward Burroughs]].