Anyway, a lot of great research on has come out since then. So here are a few new things, and a few older ones too. 4/
A paper of mine looking at hundreds of militant groups finds, for example, that ethnonationalist groups are especially likely to have rivals. (Religious groups are more likely to have alliances. The ISIS-AQ rivalry is unusual.) https://doi.org/10.1080/1057610X.2018.1431365 9/
But what are the EFFECTS of rivalry? Generally it can lead to more and more extreme violence, some work finds. Like @MiaMBloom's groundbreaking research on outbidding and suicide terror.

So we maybe shouldn't encourage inter-group competition.

http://cup.columbia.edu/book/dying-to-kill/9780231133203 10/
An article by @_justinconrad and @KevTGreene also finds militant group competition associated with more severe or shocking terrorism. https://www.journals.uchicago.edu/doi/abs/10.1086/680262?mobileUi=0&journalCode=jop
11/
FINALLY, does rivalry lead to group fragmentation? Or the reverse? I don’t know if that’s been looked at yet.

There’s the great and growing line of work on fragmentation, and someone could bring these lines of work together. (Or let us know if it’s been done already?) /16
What other research on militant group rivalry did I neglect to mention? (sorry!) I’m happy to RT more. /17
Anyway, inter-group rivalry isn’t necessarily good news; don’t celebrate the AQ-ISIS rivalry. And keep an eye on the growing research on this topic. 18/18 I think
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