Rising like a phoenix rising from the ashes, Emperor Palpatine took the shattered remnants of the Republic and fashioned a new galactic order, one that would stand the test of time.
With a focus on military might and preemptive measures the Empire conquered the known galaxy. Rebellious ideals proved the people were not capable of governing themselves. The Senate was abolished and freedom restricted.
By tearing down the Jedi Order and purging it's members the Empire had few who could resist them. For those who remained they elected their own force empowered protectors; the Imperial Knights.
Now caught in a cold war stalemate with their sworn enemy, the Alliance of Free Planets, the Empire bides it's time and waits for an opportunity to take back what was stolen.