15 Groups of 15- Geography

*Post-Soviet States: Only includes modern-day sovereign countries that have broad international recognition and UN membership, and which became independent from the Soviet Union at the time of its dissolution in 1991. Does not include breakaway republics and/or disputed territories (i.e. South Ossetia)

*CARICOM Member States: Includes one (1) Caribbean British Overseas Territory.

*Muslim-Majority Countries of the Middle East: Includes an internationally disputed territory / de jure sovereign state.