Peacekeeping operations sit within Defense & Security, the sector protecting the conditions under which every other endeavor on this list can function at all — a category with a real, cited scale: $2,887B in world military expenditure, 2025 (SIPRI). Peacekeeping operations are one of 18 of the category's 20 items directly backed by SIPRI's tracked databases — arms transfers, the Top 100 arms-producing companies, military expenditure, and nuclear forces, rather than an editorial judgment call.
In this category
Peacekeeping operations are 1 of 20 items in Defense & Security. See the full ranked list, or browse all 20 Human Endeavors categories.