The battle in Niger in which four members of a US Army Special Forces team were killed by an ISIS-affiliated group has garnered a great deal of public attention, partly because of the spat between President Trump and the family of one of the dead soldiers, Sgt. La David Johnson, but the incident also underlines the extent to which the war on terror has truly globalized since the 9/11 attacks.

A US National Counter Terrorism Center map from 2016 shows 18 countries with official branches of ISIS and an additional six countries where there are "aspiring branches" of the terror group.