Editing 1654 (section)

=== April&ndash;June ===
* [[April 5]] &ndash; The [[Treaty of Westminster (1654)|Treaty of Westminster]], ending the [[First Anglo-Dutch War]], is signed.<ref name="Cassell's Chronology266">{{cite book|last=Williams|first=Hywel|title=Cassell's Chronology of World History|url=https://archive.org/details/cassellschronolo0000will|url-access=registration|location=London|publisher=Weidenfeld & Nicolson|year=2005|isbn=0-304-35730-8|page=[https://archive.org/details/cassellschronolo0000will/page/266 266]}}</ref>
* [[April 11]] &ndash; A [[1654 Anglo-Swedish alliance|commercial treaty]] between [[Commonwealth of England|England]] and [[Sweden]] is signed.<ref name="Cassell's Chronology266"/>
* [[April 12]] &ndash; [[Oliver Cromwell]] creates a union between England and Scotland, with Scottish representation in the [[Parliament of England]].<ref name="Cassell's Chronology266"/>
* [[May 5]] &ndash; [[Cromwell's Act of Grace]], officially the Act of Pardon and Grace to the People of [[Scotland]], is proclaimed at the [[Mercat Cross, Edinburgh|Mercat Cross]] in [[Edinburgh]].
* [[May 8]] &ndash; [[Otto von Guericke]] demonstrates the power of [[atmospheric pressure]] and the effectiveness of his [[vacuum pump]], using the [[Magdeburg hemispheres]], before [[Ferdinand III, Holy Roman Emperor]], and the [[Imperial Diet (Holy Roman Empire)|Imperial Diet]] in [[Regensburg]].<ref>{{Cite EB1911|wstitle=Guericke, Otto von|volume=12|page=670}}</ref>
* [[June 3]] &ndash; [[Louis XIV of France]] is crowned at [[Reims]].
* [[June 16]] (June 6 [[Old Style]]) &ndash; [[Charles X Gustav of Sweden|Charles X Gustav]] succeeds his cousin [[Christina of Sweden|Christina]] on the Swedish throne. After her abdication on the same day, Christina, now the former reigning queen of a [[Protestantism|Protestant]] nation, secretly converts to [[Roman Catholic Church|Catholicism]].