Argonians (and Khajiit ) have been slaves for Dunmers in the 1E (I think), In the current year (Skyrims game year) Argonians have invaded Morrowind

They've killed thousnads of inocents, atleast according to the people of Solstheim .

My question is have the Argonians made Dunmers their slaves too, or have they just taken over the province?

I really want to know since it does such a huge difference, I mean enslaving a province and taking over one is completely different.