For some reason, lots of people don't seem to understand the difference between the Republic, the Separatists, the Empire and the Rebels so if you don't then you can find out. The first Galactic Republic was formed in 25,000 BBY at the same time the Jedi Order was established, 200 years after the fall of the Rakata Empire and 100 years after the Corelllians and the Duros introduced Hyperspace. The purpose of this was to maintain peace and prosperity throughout the galaxy. The headquarters were made on Coruscant, a planet which is one big city, which was a great place to build the Jedi Temple. This is where Jedi come to train. It acts as beckon of hope for the galaxy. But, the Jedi did not control the Republic because to do that they'd have to take over, which people would see a hostile action and a civil war may have broken out so instead they had the Senate. The Senate was also built on Coruscant, near to the temple. The purpose of the Senate was to make a democracy with 1 representative from each planet. These representatives’ were known as Senators. Each planet would elect it's own Senator and they would be in charge of putting across any problem the planet has regarding the law, peace etc. to the Senate. At the centre of all this there was the Supreme Chancellor. This was the person who could pass laws and was in charge of the Senate, but he did not control it because that would make it a dictatorship. Originally, in TPM, the Supreme Chancellor was Supreme Chancellor Valorum but Senator Palpatine of Naboo (aka. Darth Sidious) manipulated Queen Padmé Amidala of Naboo (aka. Padmé Naberrie but she had to change her last name for political reasons) into calling a vote of no confidence in Valorum so he could then assume the title and put his evil plan into motion. Despite Jedi training which try to suppress dark side feelings there was one Jedi in particular who fell under the influence of the dark side. This was a Jedi named Count Dooku. Trained by Master Yoda, he then went on the train Qui-Gon Jinn, one of the most influential and controversial characters in the Star Wars universe. Count Dooku felt that the Senate was being corrupted and that the Bureaucrats’ were taking over so he left the Jedi order and became under the influence of a dark lord of the Sith known as Darth Sidious. Darth Sidious then taught him the ways of the dark side and revealed his sinister plan to him. He instructed the newly renamed Darth Tyranus to create a group known as the 'Separatist movement'. His job was to spread the word that the Republic was corrupt and urge planets to leave the Republic. The planets that did became a part of the Separatist movement or the Separatists as they were commonly known as. The Separatists were controlled by Count Dooku and the home world of the Separatists was Geonosis which had one of the main Separatist droid factories. The planet was inhabited by Geonosians, controlled by Poggle the Lesser, and it was also the planet on which the Clone Wars began. The Clone Wars was a war between the Republic and the Separatists that raged on for 3 years. It ultimately ended after the destruction of General Grievous and the death of the Separatist leaders. The Empire is the Republic except Darth Sidious has: taken control of it, said the Jedi tried to overthrow and assassinate him thus making the Jedi enemies of the Republic, which Sidious then transforms into the first Galactic Empire and deems himself Emperor. Once he has control, he orders the remaining Jedi to be hunted down and killed (Order 66) Had Anakin not been burned badly by the lava and needed to have been put in a black suit with life support which he needs, Lord Sidious would've probably succeeded. However, because he was, the clones had to hunt them down instead which meant that they couldn’t be 100% successful so some Jedi did survive. However, in the Force Unleashed game Darth Vader did train his own apprentice which hunted down surviving Jedi but that's a different story. Some systems did leave the Empire though because, even though Lord Sidious was the Emperor, he needed to keep the Senate in tact, so Senators were still around and they had to be able to leave if they wanted. This is why the Death Star was created; everyone would fear the Empire and stay a part of it to survive. The Empire then changed the clones into Stormtroopers who were originally all the same: 'To symbolise the purity of the new Empire' – Secrets of the Galaxy: Battles for the Galaxy (book) Even though they possessed a lot of power, weapons and the Death Star (which was incomplete at first), there were a few individuals who strongly opposed the Empire. These were known as Rebels. The Rebel alliance was created by the original Rebels. It was created in memory of Darth Vader’s secret apprentice, Galen Marek (codenamed Starkiller), who died saving them in a battle against Lord Sidious and Darth Vader. Starkiller had been swayed away from the dark side of the force and taught the light side by Rahm Kota, who he had originally been sent to kill. The original Rebels were: Senator Mon Mothma of Chandrila, Senator Bail Organa of Alderaan (32 BBY - 19 BBY), Senator Leia Organa of Alderaan, Juno Eclipse and Rahm Kota. The Rebels were targeted by the Empire because they posed as a potential threat and they knew that they could destroy the Empire. But, they couldn't just attack the Rebels originally because they hadn't done anything yet so it was still illegal by the laws put in place by the Senate. Some of the Rebel's were Jedi. Originally there was Rahm Kota but we don't know what happens to him because he's alive at the end of Star Wars The Force Unleashed II and we never see him again (maybe they'll be another game with his death or maybe there already has been and I missed it. If so, tell me) The next known Jedi to join the Rebel alliance is Luke Skywalker many years later but Luke is still only a padawan as he'd only learnt of the Force and met Ben/Obi-Wan Kenobi a few days ago and Kenobi had already been killed by Darth Vader. But Luke was clearly strong in the force (being the son of Anakin Skywalker) and he use his insight and feelings to fire his torpedo into the Death Star, destroying it. Luke then went on to find Yoda who helped complete his Jedi training but Luke left the training early to go and save Han, Leia and the others. Yet, when Luke returned to Dagobah to find Yoda he was told that he needed to do only one thing to become a Jedi. This was: to confront Vader. Yoda also enlightened him that Vader was indeed his father as Vader had told him when he went to Cloud City to save the others. With his dying words he also told him that he had a twin sister which Luke quickly realised to be Leia. Will Leia learn the force also? We'll just have to wait and see in Episodes 7, 8 and 9 (7 is in the cinemas 18 December 2015) Eventually, Luke confronts Vader who brings him before the Emperor. The Emperor fails to turn him to the dark side so he tries to kill him with is sith lightning. However, watching his son be tortured causes Anakin to resurface inside of Vader and he redeem himself by throwing Sidious into the Death Star's core, destroying him and fulfilling the prophecy told: The Chosen One, conceived of the midichlorians, would one day bring balance to the force. However, doing this Vader's life support is damage by Sidious' sith lighting and he's dying. As he dies, Luke takes of his mask and Anakin looks on him for the first time with his own eyes. He then becomes one with the force along with Yoda and Obi-Wan. Whilst this was happening, a Rebel strike team had landed on the small forest moon on Endor with a mission to knock out the shield generator which protects the Death Star from any attack. After befriending a tribe of small creatures called Ewoks, they attacked the shield generator and a great battle took place. The Rebels and Ewoks were victorious and they used charges to blow up the generator which left the Death Star open to attack. So a small fleet of Rebel ships entered to Death Star's super-structure and blew up the core just escaping at the same time as Luke flew away in a stolen Imperial Shuttle with Anakin's body inside with him. There were celebrations across the galaxy in celebration of the Empire being defeated. Back on Endor, Luke burnt the body of his father in the traditional Jedi way. He then saw the spirits of Yoda, Obi-Wan and Anakin on Endor as the Ewoks and the Rebels celebrated. I hope this has helped you and if I’ve missed anything or have got anything wrong then just say.