Licenses & data
Attributions for the sources used by Chronos.
cShapes 2.0
Schvitz, G., Girardin, L., Rüegger, S., Weidmann, N. B., Cederman, L.-E., & Gleditsch, K. S. (2022). Mapping the International System, 1886–2019: The CShapes 2.0 Dataset. Journal of Conflict Resolution, 66(1), 144–161.
Non-commercial · Share-Alike. Borders derived from cShapes inherit the CC BY-NC-SA 4.0 licence.
Natural Earth
Basemap country outlines (pre-1886 rendering) — Free vector and raster map data.
Wikipedia
Links in the info panel point to Wikipedia, whose text is distributed under CC BY-SA 4.0.
Chronos is an educational project. None of the cited sources endorse or are affiliated with it.