For the real timeline, see 19th century at Wikipedia.

The 19th century AD is defined by the calendar of Earth as occurring from the year 1801 through the year 1900.


Dukat stated that the Cardassian system of government had been in place for more than 500 years.
The United States Military Academy at West Point is founded on Earth. The institution will later provide education for United Earth MACO officers. (ENT: "Hatchery")
The Battle of Trafalgar is fought. On Earth, the current world powers Spain, France, and Great Britain fight this battle, in which an ancestor of Jean-Luc Picard takes part. (TNG: "The Best of Both Worlds"; Star Trek Generations)
Wu is born on Omega IV. (TOS: "The Omega Glory")
In the holoprogram Paris 042, Sullivan's pub is established in Fair Haven, Ireland. (VOY: "Fair Haven")
Napoléon Bonaparte reaches the height of his conquests in Europe. His exploits are viewed over 450 years later by the alien Trelane via a long-range observation telescope. (TOS: "The Squire of Gothos")
In the episode "The Squire of Gothos", Captain Kirk mistakenly stated that Trelane was viewing the events of "900 years past", meaning that the Original Series would be taking place in 28th century instead of the 23rd.
Writer John Keats dies in the city of Rome on Earth. The famous poet's premature death was brought on by an entity named Onaya, who helped Keats find his creative voice while feeding on his neural energy. (DS9: "The Muse")
Following Texas' declaration of independence, Mexican forces led by General Santa Anna surround the Alamo, an old Spanish mission housing 188 Texian "rebels", led by Colonel's Davy Crockett, William B. Travis and Jim Bowie. On March 6, 1836, after a 13-day siege, Santa Anna attacked the mission. Despite a heroic effort by the Texians, Santa Anna is ultimately victorious in eliminating all of the Texians rebels in what history would later remember as the Battle of the Alamo. (DS9: "Wrongs Darker Than Death or Night", "Once More Unto the Breach", et al)
Around the 1850s
The Suliban homeworld becomes uninhabitable, forcing its population to leave. (ENT: "Detained")
A couple marry on Vega Reticuli. On their 300th wedding anniversary they would go to Risa and meet Jonathan Archer. (ENT: "Two Days and Two Nights")
Abe Lincoln wins election

Voters celebrate Lincoln's victory in 1860

Abraham Lincoln wins the presidential election. (TOS: "The City on the Edge of Forever")
By this point, the Vulcans had rebuilt their society and resumed interstellar travel. (ENT: "The Forge")
Soval says that it took his people "nearly 1500 years" to rebuild their world and reach for the stars after the Time of Awakening in 370 AD.
A group of Humans are abducted from Western North America by the Skagarans, an alien species, which wants to enslave its captives. The Humans are brought to a M-class planet inside the Delphic Expanse where they soon overwhelm their oppressors and start to rebuild their society by founding a Western-like colony. (ENT: "North Star")
The date of the Humans' abduction is given indirectly as "40 years before the first flight of the Wright brothers," placing it around 1863.
Victor Hugo's Les Misérables is published. (DS9: "For the Uniform")
June, 1864
The Battle of Pine Mountain is fought during Sherman's March to the Sea. Thaddius Riker, an ancestor of William T. Riker, is rescued by Quinn, a member of the Q Continuum, after being injured on a battlefield in the American Civil War. (VOY: "Death Wish")
September 21, 1866
Birth of H.G. Wells (DS9: "Far Beyond the Stars"; VOY: "The 37's"; ENT: "Similitude")
The composer Johannes Brahms, living in the city of Vienna, Austria, writes some of his most well known musical pieces. Nearly four hundred years later, Flint claims that he once lived as Brahms and was responsbile for these accomplishments. (TOS: "Requiem for Methuselah")
Colt Firearms introduces the Colt .45 caliber double-action cavalry pistol. (TNG: "Time's Arrow")
October 26, 1881
The infamous gunfight at the OK Corral is fought in Tombstone, Arizona on Earth. The event would forever define the violence and lawlessness which has become associated with the Ancient West. (TOS: "Spectre of the Gun")
The Orient Express, a transcontinental railroad on Earth, begins service between Paris and Istanbul. (TNG: "Emergence")
The Redjac entity, incarnated as "Jack the Ripper" kills seventeen women in London on Earth. (TOS: "Wolf in the Fold")
early 1890s
Guinan takes up residence on Earth. (TNG: "Time's Arrow")
August 13, 1893
A group of shapeshifters from Devidia II arrive on Earth, using a cholera epidemic as cover to kill Humans in order to steal their neural energy. Data is accidentally thrown back in time to here and attempts to stop the Devidian, Samuel Clemens from revealing information about him and any disruptions to the timeline. Crew members from the USS Enterprise-D follow the Devidians back in time from the 24th century to stop them. (TNG: "Time's Arrow")
Data's head is accidentally blasted off by the cane that let the Devidians travel through time, and is left there until 2368 with a message from Picard. (TNG: "Time's Arrow, Part II")

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