Editing April 21 (section)

===1601–1900===
*[[1615]] &ndash; The [[Wignacourt Aqueduct]] is inaugurated in [[History of Malta under the Order of Saint John|Malta]].
*[[1782]] &ndash; The city of Rattanakosin, now known internationally as [[Bangkok]], is [[History of Bangkok|founded]] on the eastern bank of the Chao Phraya River by King [[Buddha Yodfa Chulaloke]].
*[[1789]] &ndash; [[John Adams]] sworn in as first [[Vice President of the United States|US Vice President]] (nine days before George Washington).{{sfn|McCullough|2001|pp=393–394}}
*  1789   &ndash; [[George Washington's reception at Trenton]] is hosted by the Ladies of Trenton as he journeys to New York City for his [[first inauguration of George Washington|first inauguration]].<ref>{{cite web |last1=Washington |first1=George |author-link=George Washington |title=From George Washington to the Ladies of Trenton, 21 April 1789 |url=https://founders.archives.gov/documents/Washington/05-02-02-0095 |publisher=[[National Archives and Records Administration|Founders Online, National Archives]] |date=April 21, 1789}}</ref>
*[[1792]] &ndash; [[Tiradentes]], a [[revolutionary]] leading a movement for [[Independence of Brazil|Brazil's independence]], is [[hanged, drawn and quartered]].
*[[1796]] &ndash; [[War of the First Coalition]]: In the climax of the [[Montenotte Campaign]], [[Napoleon Bonaparte]] decisively defeats the army of Piedmont at the [[Battle of Mondovi]], leading to Piedmont's surrender a week later and decisively turning the Italian campaign in France's favor.<ref>{{cite web | url=https://www.napoleon-empire.org/en/battles/mondovi.php | title=Battle of Mondovì }}</ref>
*[[1802]] &ndash; Twelve thousand Wahhabis [[Wahhabi sack of Karbala|sack Karbala]], killing over three thousand inhabitants.
*[[1806]] &ndash; [[Action of 21 April 1806]]: A French frigate escapes British forces off the coast of South Africa.
*[[1809]] &ndash; Two Austrian army corps are driven from [[Landshut]] by a [[First French Empire]] army led by [[Napoleon]] as two French corps to the north hold off the main Austrian army on the first day of the [[Battle of Eckmühl]].
*[[1821]] &ndash; [[Benderli Ali Pasha]] arrives in Constantinople as the new [[Grand Vizier of the Ottoman Empire]]; he remains in power for only nine days before being sent into exile.
*[[1836]] &ndash; [[Texas Revolution]]: The [[Battle of San Jacinto]]: [[Republic of Texas]] forces under [[Sam Houston]] defeat troops under Mexican General [[Antonio López de Santa Anna]].
*[[1856]] &ndash; [[Australian labour movement]]: Stonemasons and building workers on building sites around Melbourne march from the University of Melbourne to Parliament House to achieve an [[eight-hour day]].
*[[1894]] &ndash; Norway formally adopts the [[Krag–Jørgensen]] bolt-action rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.
*[[1898]] &ndash; [[Spanish–American War]]: The United States Navy begins a blockade of [[Spanish Cuba|Cuba]]n ports. When the [[United States Congress|U.S. Congress]] issued a [[declaration of war]] on April 25, it declared that a state of war had existed from this date.