Editing 1851 (section)

=== April&ndash;June ===
* [[April 8]] &ndash; [[Western Union]] is founded, as the ''New York and Mississippi Valley Printing Telegraph Company''.<ref>{{cite book|author=United States. Congress. House. Committee on Patents|title=Pooling of Patents: Hearings Before the Committee on Patents|url=https://books.google.com/books?id=Ou1sAAAAMAAJ&pg=PA1912|year=1936|publisher=U.S. Government Printing Office|pages=1912}}</ref> 
* [[April 9]] &ndash; [[San Luis, Colorado|San Luis]], the oldest permanent settlement in the state of [[Colorado]], is founded by settlers from [[Taos, New Mexico]].
* [[April 20]] &ndash; [[Ramón Castilla]] loses power in [[Peru]].
* [[April 23]] &ndash; [[Anne Darwin]], daughter of [[Charles Darwin]] dies, sending him into a great depression. 
* [[April 25]] &ndash; [[Placer County, California]], is formed from parts of [[Sutter County, California|Sutter]] and [[Yuba County, California|Yuba]] Counties with [[Auburn, California|Auburn]] as the county seat.
* [[April 28]] &ndash; [[Santa Clara College]] is chartered in [[Santa Clara, California]].
* [[May 1]] &ndash; ''[[The Great Exhibition]] of the Works of Industry of All Nations'' in [[the Crystal Palace]], [[Hyde Park, London]] is opened by [[Queen Victoria]].
* [[May 15]]
** The first [[Australian gold rushes|Australian gold rush]] is proclaimed, although the discovery had been made three months earlier.
** [[Alpha Delta Pi]] sorority, the first secret society for women, is founded at [[Wesleyan College]] in [[Macon, Georgia]] (U.S.)
** [[Mongkut]]  is crowned as King (Rama IV) of [[Rattanakosin Kingdom|Siam]], at the [[Grand Palace]] in [[Bangkok]].
[[File:Rama4pic.jpg|thumb|120px|right|[[May 15]]: [[Ramai IV of Thailand|Rama IV]] is crowned as the King of Siam.]]
* Mid-[[May]] to mid-[[July]] &ndash; Great [[Flood of 1851]]: Extensive flooding sweeps across the [[Midwestern United States]]. The town of [[Des Moines]] is virtually washed away, and many rainfall records hold for 160 years.
* [[June 2]]
** [[Maine]] passes the first state-wide prohibition [[Maine law|law]] in the United States.
** [[Castle & Cooke]], the predecessor of [[Dole Food Company]], is founded in [[Hawaii]].<ref>{{cite book|author1=Castle and Cooke, Ltd|author2=Castle & Cooke|title=The First 100 Years: A Report on the Operations of Castle & Cooke for the Years 1851-1951|url=https://books.google.com/books?id=_ibRAAAAMAAJ|year=1951|page=11}}</ref>
* [[June 21]] &ndash; The [[Immortal Game]], a famous [[chess]] match, is played between [[Adolf Anderssen]] and [[Lionel Kieseritzky]], during a break in the [[London 1851 chess tournament|first international tournament]], held in London.