One row per year in which a pair of actors (governments, rebel groups) was in armed conflict with at least 25 battle-related deaths, from the UCDP Dyadic Dataset version 26.1.
Format
A data frame with 3,518 rows: year, sender (side A), receiver
(side B), dyad_id, conflict_id, location, intensity_level
(1 = 25 to 999 deaths, 2 = 1,000 or more), type_of_conflict (1
extrasystemic, 2 interstate, 3 intrastate, 4 internationalised intrastate).
Source
Uppsala Conflict Data Program, https://ucdp.uu.se/downloads/, licence CC BY 4.0. Cite: Harbom L, Melander E, Wallensteen P (2008). Dyadic dimensions of armed conflict, 1946–2007. Journal of Peace Research 45(5), 697–710, doi:10.1177/0022343308094331 ; and Davies S, Pettersson T, Öberg M (2025). Organized violence 1989–2024. Journal of Peace Research.