Very easily, thank you for asking.
I let it be known that our race is the oldest in Tamriel, we have been co-existing with our Hist brethren way before you Dunmers ended up with a permanent case of the ugly. Also, might I remind you that your ashen skinned kind can't even set foot into Black Marsh without getting infected by a lethal disease or your face bitten off by the unique wild life? You had to send in your Argonian slaves to work on the plantation as we are the only ones who can survive in the treacherous swamps.
You may be the oldest race (I haven't checked the Lore in a bit, but I think the Aldmer and the Khajiit would dispute your claim), but you are far from the strongest. Hence the history of being enslaved. And our Overseer's seemed to handle Black Marsh territory just fine. That's what the Restoration School is for. And do you
really want to tangle with the Legendary Destruction Mages of the Dunmer forces? Or our elite swordsmen? It didn't work out so well for any other time before, you had to wait for an asteroid and the largest volcano in Tamriel to erupt, in our homeland, before you could act.

Fact is, you ended up enslaving our kind for labor because the supposedly superior Dunmers can't even lift cutlery without straining a muscle, let alone do actual physical work.
It's not that we
can't lift cutlery or that we'd strain something. The simple fact is that doing such... menial things would be very far below the perfection that we Dunmer have achieved. It would be beneath us, so we have out slaves do it.
And now scramble back to the ruins of Vvardenfell and save whatever meager wealth you accumulated before we decide to return for a second round.

Actually, our beloved Vvardenfell is a smoking crater right now due to a sizable asteroid. We are currently rebuilding on Solstheim (according to the Lore), and go ahead and try a second time. We're stronger now than we were when you carrion lizards stole your weak, cheap rampage across lands you couldn't even keep a hold of; and I've never heard of a race in Tamriel that was willing to risk a second round of enforced slavery upon themselves... but I guess it's possible.

So bring it on. Morrowind will probably secede from the Empire due to their lack of help during our time of need, and we the beloved Dunmer will be back with a vengeance not yet seen in its ferocity in all of Tamriel!
