Kenya
Like Cernig, I have to do a lot more research before I'd trust myself to offer any kind of opinion on the deteriorating situation there, but this post at the PoliGazette likening Kenya to a possible Rwandan situation does provoke a question I'll be looking for an answer to.
The aftermath of the genocide in Rwanda sparked a much larger, and mostly ignored, multi-sided bloodbath centered in neighbouring Congo, with, at its peak, something like 20 African militaries involved, and smaller massacres and other reverberations continuing to this day.
Refugees from neighbouring conflicts creating conflicts in the host countries are far from uncommon, as Lebanon can attest, and as Chad, neighbouring the Darfur region of Sudan, is also in the midst of.
Kenya has been receiving a large influx of refugees from the Somali-Ethiopian conflict in the north. Both from Somalia proper and from the under-reported Ogaden region. So the question is:
Did that influx of refugees and the strain they put on Kenya's resources prove the tipping point in the underlying issues of those resources' distribution among Kenya's own multi-ethnic population?
