Earth-1

"This Earth is at the center of the multiverse. It's the access point to every other Earth in existence."

- Hunter Zolomon, referring to Earth One

Earth One is a universe parallel to a plethora of others, such as Earth Two. The name was coined by Martin Stein. To Earth Two citizens, Earth One is referred to as Earth Two. Also, to Earth Seventeen's citizens, it is known as Terra Prime.

Earth One is particularly important in that it is a central junction in the multiverse, being the middle intersection from which one can travel to any other alternate Earth.

History
After learning of the existence of parallel worlds, Martin Stein coined the world's name, "Earth One", to describe Team Flash's relative position in regards to all of the other worlds. Beginning in the early 21st century, it has become home to numerous groups of extraordinary protectors, such as the vigilante unit Team Arrow, the scarlet speedster known as the Flash and his team of allies who emerged after the explosion of the S.T.A.R. Labs particle accelerator that gave rise and prominence to superpowered metahumans, and John Constantine's group of mystical allies. Even in other times, similar such heroes operate, such as the secret mid-20th century alliance the Justice Society of America, and the time-travelling Legends.

Events (in chronological order)
B.C. A.D.
 * Trojan War (1258-1248)
 * American Revolutionary War (1775-1783)
 * American Civil War (1861-1865)
 * World War I (1914-1918)
 * Spanish Civil War (1936-1939)
 * World War II (1939-1945)
 * Cold War (1947-1991)
 * Vietnam War (1955-1975)
 * Gulf War (1990-1991)
 * Afghan War (2001-present)
 * Alpha-Omega Release (Hong Kong) (2010)
 * The Undertaking (2013)
 * S.T.A.R. Labs particle accelerator explosion (2013)
 * The Siege (2014)
 * Genesis (2016)
 * Crisis of 2024 (2024)

Timeline alterations

 * Flashpoint (briefly; deleted due to Barry's restoration of the timeline)
 * Legion of Doom's alternate reality (briefly; deleted due to the Legends' intervention)
 * Anachronisms (sudden prominence throughout time as a result of the time storm caused by the Legends)

From Earth Two

 * Laurel Lance/Black Siren
 * Shay Lamden/King Shark
 * Linda Park/Dr. Light
 * Hunter Zolomon/The Flash/Zoom/Black Flash (deceased)
 * Dante Ramon/Rupture  (deceased)
 * Al Rothstein/Atom-Smasher  (deceased)
 * Eddie Slick/Sand Demon  (deceased)
 * Solovar
 * Harrison "Harry" Wells
 * Jesse Wells/Jesse Quick
 * Zoom's meta-human group

From Earth Three

 * Jay Garrick/The Flash

From Earth Nineteen

 * Cynthia/Gypsy
 * Josh/Breacher
 * Harrison "H.R." Wells (became permanent resident, deceased)

From Earth Thirty-Eight

 * Kara Danvers/Supergirl
 * Mon-El
 * J'onn J'onzz/Martian Manhunter

From an unknown Earth

 * Music Meister

Arrow
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The Flash
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Constantine
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Vixen
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DC's Legends of Tomorrow
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Trivia

 * Earth One vibrates at a lower frequency than Earth Two.

Behind the scenes

 * The universe's name is spelled "Earth-1" in the synopses for The Flash episodes.