Editing 1825 (section)

=== July–September ===
[[File:StocktonDarlingtonOpening.jpg|thumb|September 27: The [[Stockton and Darlington Railway]] opens in England.]]
* [[July 6]] 
** The Duke of [[Schleswig-Holstein-Sonderburg-Beck]] gains possession of [[Glücksburg]] and changes his title to [[Friedrich Wilhelm, Duke of Schleswig-Holstein-Sonderburg-Glücksburg]]. The line of Schleswig-Holstein-Sonderburg-Glücksburg later becomes the [[dynasty|royal house]] of Greece, Denmark and Norway.
** The U.S. Senate ratifies treaties with the [[Cheyenne]] tribe.<ref name=Niles/>
** A new [[Combinations of Workmen Act 1825|Combinations of Workmen Act]] in the United Kingdom makes [[trade union]]s legal according to narrowly defined principles.
* [[July 16]] – The U.S. Senate ratifies treaties with the [[Hunkpapa]] tribe.<ref name=Niles/>
* [[July 18]] – The U.S. Senate ratifies treaties with the Ricara tribes.<ref name=Niles/>
* [[July 30]]
** [[Malden Island]] (an uninhabited island in the central Pacific Ocean) is discovered by [[George Byron, 7th Baron Byron]].
** The U.S. Senate ratifies treaties with the [[Mandan]], Belantae, Eloa and [[Minnetaree]] tribes.<ref name=Niles/>
* [[August 4]] – The U.S. Senate ratifies treaties with the Ricara tribes.<ref name=Niles/>
* [[August 6]] – [[Bolivia]] [[Bolivian War of Independence|gains its independence]] from Spain as a republic, at the instigation of [[Simón Bolívar]].
* [[August 11]] – The U.S. Senate ratifies treaties with the [[Crow people|Crow tribe]].<ref name=Niles/>
* [[August 18]] – Scottish adventurer [[Gregor MacGregor]] issues a £300,000 loan with 2.5% interest, through the London bank of Thomas Jenkins & Company, for the fictitious Central American republic of Poyais. His actions lead to the [[Panic of 1825]], the first modern [[stock market crash]], in England.
* [[August 22]] – The [[:es:Rito Nacional Mexicano|National Mexican Rite]] is created in [[Mexico City]].
* [[August 25]] – [[Uruguay]] is declared independent of the [[Empire of Brazil]] by the [[Thirty-Three Orientals]], a militant revolutionary group led by [[Juan Antonio Lavalleja]].
* [[September 25]] – General [[Hendrik Merkus de Kock]] lifts the siege of [[Jogjakarta]], the first major action of the [[Java War]].
* [[September 26]] – The U.S. Senate ratifies treaties with the [[Missouria|Missouri]] and Ottoe tribes.<ref name=Niles/>
* [[September 27]] – The world's first modern railway, the [[Stockton and Darlington Railway]], opens in England.
* [[September 30]] – The U.S. Senate ratifies treaties with the [[Pawnee people|Pawnee]] tribe.<ref name=Niles/>
* [[September]] – The [[Lady Margaret Boat Club]] is founded by 12 members of [[St John's College, Cambridge]].