Declaration of the Rebel Alliance (Earth-2042)

"We agree that the time for diplomacy and politics has passed. It is now time for action... Therefore let this be an official declaration of rebellion! Today, we all vow to change the galaxy, and one day the galaxy will indeed be free!"

- Bail Organa

The Declaration of the Rebel Alliance was an accord that created the Alliance to Restore the Republic. Signed by the leaders of anti-Imperial resistance groups on Alderaan, Corellia, and Chandrila, the treaty formally declared war on the Empire and was signed on Dantooine. Though the meeting to create the treaty was arranged by Galen Marek, this proved to be a deception by his former master, Darth Vader, who raided the meeting with the Stormtrooper Corps and captured the two of three senators. Had Galen not survived his confrontation with his former master, the Empire would have effectively ended the Rebellion before it even began.

After a daring pursuit by Imperial forces, Senator Mon Mothma made a speech from the rebel VCX-100 light freighter Ghost, on all rebel communications channels and on HoloNet broadcasts where rebel forces could slice into, in which she resigned from the Imperial Senate and condemned the actions of the Galactic Emperor Sheev Palpatine.

Source

 * https://starwars.fandom.com/wiki/Declaration_of_the_Rebel_Alliance
 * https://starwars.fandom.com/wiki/Corellian_Treaty