The following events took place in 20 BBY.
This year was known as Year 15 after the Great ReSynchronization.
- Beginning of the Vandal Wars.
- End of the first part of the Vandal Wars.
- Nathaniel Kenobi is knighted.
- Leykor-Varrk Compromise takes effect.
- Utaalk's term as mayor of Raxus Prime ends.
- Alpha Red Asteroid Base is constructed.
- Leviathan Armament Project initiates.'
- Confederate forces temporarily occupies North Valand in the North Valand Campaign, North Valandan Confederate sympathisers and pro-Confederates, which were common the southern part of North Valand bordering the Republic of Valand, assist in the retaking of North Valand, two North Valandan Confederate units of distinction were the 191st (North Valand) Infantry Regiment and the North Valand Irregulars.
- Oliver Irton, a Confederate sympathizer from North Valand and brother of President Henry Irton of North Valand, forms the Provisional Government of the Independent State of North Valand, merging all pro-Confederate North Valandan rebel units under a single organization, the Provisional Government will become the new Senate of North Valand following the Confederate victory in the North Valand Campaign.
- North Valand votes to join the Confederate States of Earth as an independent state, the majority of Unionist North Valandans fled to Union-held territory following the Confederate occupation, leaving a Confederate-sympathizing majority of the North Valandan population.
- The Zann Consortium steals the prototype Zelac-class Star Destroyer.
- Veight Station is destroyed.
- The Confederate States of Earth wins the Earth Civil War through the capture of President Williams leader of the Union of Earth States, at the Battle of Fort Precipice, and the Siege of Williamstown, the Union capital, as a result of the Union agrees to sign a peace treaty in return for their president, the result is the Treaty of Williamstown, in which the U.E.S is forced to grant legitimacy to the Confederacy, and is treaty bound to respect the C.S.E's independence.
- The day on which the signing of the Treaty of Williamstown took place becomes the Confederate Independence Day, an annual holiday in which the C.S.E gives thanks for its independence, self-determination, liberty and those died for its freedom.
- The Confederate States of Earth Army forms the Army of Occupation, an army of reservists and volunteers, the purpose of the army is to maintain forces within the Union of Earth States, to ensure the Union doesn't attempt to restart the Earth Civil War.
- The Dalek Empire takes over the galaxy
- Battle of Leziquk
- Operation Forager
- Battle of Tython
- Second Battle of Ithor
- Bombardment of Kamino
- First Battle of Kamino
- Raid on Kashyyyk
- Battle of Coruscant
- Battle of Naboo
- Battle of Jem7 takerd place New Republic era (Lord Sidious)
- Earth Civil War (21 BBY - 20 BBY)
- Second Battle of Ord Zathuun
- Battle of Erayyxa
- Second Battle of Bakura
- Battle of Sekigahara
- R3-L6 on Woka
- A'den Kad on Mandalore
- Jax Mooncylle on Tatooine
- Igar Drelosyn on Kuat
- Irol Elsek on Tatooine
- Sena Tavari on Byss
- Elscon Hinchlore on Daroon
- Floo Iskis on Ord Mantell
- Valos Clensaa on Bandonia
- Munto Kyliff on Ajampor
- Iothe Druna on Anobis
- Nim-Adko on Leziquk
- Pyrn Werd on Leziquk
- Vearn Laannl on Leziquk
- Tesrn Edap on Leziquk
- Reen Vaiin
- Editru Pflufurger on Bruvia
- Karis Dron on Krellok
- Saché Aeyinson on Naboo
- Dormé Costil on Naboo
- OOM-5 on Ithor
- Most of the Wookiee Guild members on Kashyyyk.
- Babbsi Reyhan Bent on Norval II
- Ct-3222 on Bakura
- CT-2327 on Bakura
- Amyette Balkar on Ord Zathuun
- Deloks Catax on Kashyyyk
- During the Campaign of Naboo
23 BBY 22 BBY 21 BBY - 20 BBY - 19 BBY 18 BBY 17 BBY