Editing 1621 (section)

=== April&ndash;June ===
* [[April 1]] &ndash; The [[Plymouth, Massachusetts]] colonists create the first treaty with native Americans.
* [[April 5]] &ndash; The ''[[Mayflower]]'' sets sail from [[Plymouth, Massachusetts|Plymouth]], on a return trip to England.  
* [[April 9]] &ndash; The [[Twelve Years' Truce]] between the [[Dutch Republic]] and the [[Spanish Empire]] expires, and both sides prepare to resume the [[Eighty Years' War]].
* [[May 2]] &ndash; The [[1621 Panama earthquake|Panama earthquake]] affects the [[Isthmus of Panama]], with an estimated magnitude of 6.9, and a maximum [[Mercalli intensity scale|Mercalli intensity]] of VII.
* [[May 12]] &ndash; The city of [[Tornio]] in [[Lapland (Finland)|Lapland]] is founded by King [[Gustavus Adolphus|Gustavus Adolphus of Sweden]], becoming the northernmost city in the world at the time.<ref>{{cite web|url=https://yle.fi/uutiset/3-11927599|title=Kojamo-veistos yhdistää asiat, joista 400-vuotias Tornio elää: teräksen ja lohen – tutkija listaa 5 tapahtumaa, jotka ovat muuttaneet kaupunkia|website=YLE|date=May 12, 2021|access-date=September 2, 2021|language=fi}}</ref>
* [[May 24]] &ndash; The [[Protestant Union]] is formally dissolved.
* [[June 3]] &ndash; The [[Dutch West India Company]] is founded.<ref>{{cite book|author=Nelson Greene|title=History of the Valley of the Hudson: River of Destiny, 1609-1930|url=https://books.google.com/books?id=cPcLAAAAYAAJ|year=1931|publisher=S.J. Clarke Publishing Company|page=215}}</ref>
* [[June 21]] &ndash; [[Thirty Years' War]]: [[Old Town Square execution|Twenty-seven Czech lords are executed on the Old Town Square]] in [[Prague]], as a consequence of the [[Battle of White Mountain]].
* [[June 24]] &ndash; [[Huguenot rebellions]]: [[Saint-Jean-d'Angély]] is taken, after a [[Siege of Saint-Jean-d'Angély (1621)|26-day siege]] by Royal forces.