The Correlates of War Project

We'd like to officially welcome COW's new Graduate Assistant, @soyeonelenakim.bsky.social of @utgovernment.bsky.social.

We’re aware that our website is currently down, and we hope to have it restored in a few days. Sorry for the interruption!

One of the upgrades we'll be making to the War Data in the @correlatesofwar.bsky.social is updating the data to the present (it ends in 2007). That leads to a "pop quiz" to test your knowledge of wars and the COW war coding rules Question: Will the 2008 Russo-Georgian War be added to the COW data?

I officially started an important new research project this summer: becoming a data host for the Correlates of War! Specifically, I am now the curator for the COW data on interstate, intrastate, and extrastate wars.

Of wars that get to the 74 day mark, the median total duration is 261 days. Which is grim news those who have noted that the Iran war will cause major economic problems if it lasts even another month. #rstats blog post, with @correlatesofwar.bsky.social data, at freerangestats.info/blog/2026/05...

COW on @factcheck.org discussing when a war is (and isn't) a "war". www.factcheck.org/2026/03/is-t...

(This also reminds us of the need to introduce some more consistent version-numbering rules, which we'll do in the not-too-distant future.)

We've introduced a minor update to COW's State System Membership Data, updating the coverage through 2024 and making available "blank" dyad-year and directed dyad-year data sets, in addition to the traditional state-year data. correlatesofwar.org/data-sets/st...

Announcing the barest of web redesigns at correlatesofwar.org. Look on our new logo, ye mighty, and despair.

Brand new COW data set. Check it out.

COW is pleased to announce the new Arms Technology Data Set, maintained by Jacob Gerner Hariri and Asger Mose Wingender, tracking arms tech adoption by state 1816-2023, from percussion lock muskets to armed drones! Available here: correlatesofwar.org/data-sets/ar...

And let’s be honest: managing multiple accounts is tough. Any stray comments here about Guided by Voices are probably @thescottwolford.bsky.social, and any about Govt Mule are probably @jeffcarter.bsky.social (Deleted the previous b/c we still don’t know how to do proper mentions on Bsky.)

Hey, folks. After a bit of a delay, COW has moved from the place formerly known as the bird site to BlueSky. Watch this space for updates from Co-Directors @jeffcarter.bsky.social and @thescottwolford.bsky.social, and, in even better news, a brand-new COW Data Set in a week or so.