It probably correlates closely with the democracy index [1].
To go out on a limb and propose my own dumb hypothesis, I would wager that it is at least somewhat inversely proportional to percentage of tax base spent on military expenditures [2]. Countries that are growing or spending money on maintaining hegemony want to keep populations voting in a way that continues to support these industries. Distraction, polarization, disenfranchisement, and stoking nationalism are just a few of the ways this can be accomplished. Pacifist nations don't have these concerns and can focus more internally.
It probably correlates closely with the democracy index [1].
To go out on a limb and propose my own dumb hypothesis, I would wager that it is at least somewhat inversely proportional to percentage of tax base spent on military expenditures [2]. Countries that are growing or spending money on maintaining hegemony want to keep populations voting in a way that continues to support these industries. Distraction, polarization, disenfranchisement, and stoking nationalism are just a few of the ways this can be accomplished. Pacifist nations don't have these concerns and can focus more internally.
[1] https://en.wikipedia.org/wiki/Democracy_Index
[2] https://en.wikipedia.org/wiki/List_of_countries_by_military_...