They wiped out the Left Handed Elves, sank their home continent and also fought off the Bretons in war, as well as (CAUTION: Daggerfall lore) an army of Goblins (could be Orcs, since the story fits them more) that spawned through portals. Not to mention they fought off the Empire (Cyrus), and the Dominion.
Come at me. :[
I changed it to "Redguards of Tamriel", but I'll humor you. (Don't take this as me bashing Redgaurds, I actually really like them) I wouldn't count any of those as dominating, more like self defense. They just were fighting off oppressors.
The Nords cleaned the floor with the Snow Elves so badly that they allowed the Dwemer to blind them in exchange for safety. The Nords kicked the crap out of the Dragons and their cult when Alduin was sent forward in time. They essentially created the Empire and curb stomped the first Dominion. The Redguards drove off the Empire with Cyrus's help. The Stormcloaks drive off the Empire with Dovakiin's help.
Much of the Daggerfell stuff they can thank the Agent for.