Not directly related, but you might be interested by Family tree by Sheree S Tepper. The aliens aren’t actually. Kinda.
Science Fiction
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Star Trek has a bit of that here and there. Klingons are basically at a constant state of cold war between different clans and the Romulans are actually Vulcans that have split off from the Vulcans after a civil war. And of course there is a lot of political infighting within the Romulan Empire as well.
Lem's Fiasco is one of these. Can't tell more without spoilers, though
Timothy Zahn's Cobra series
The Praxis
While this might not fit 100% but I really liked The Moon Is a Harsh Mistress by Robert A. Heinlein in which he describes a conflict (thats one of two main plots) between unified Earth and the Moon which is a giant penal colony.
It sounds like Three Body Problem is right up your alley!
One of the basic premises is what happens in First Contact when Earth fails to unite.