Hate to break it to you, but Star wars has always done, if not repeated history, stuff that rhymes. Check out knights of the old republic, or the prequels, or the expanded universe. It's the same damn thing every time. (Republic faces grave threat, empire like evil faces heroes, republic is back on top. Over and over again.)
Uhhh... Eps IV-VI kind of don't really have a Republic. to face a grave thread or be back on top.
The Mod on the Silver Mountain avatars by the wonderfully talented Cuthalion!