Adoption of the metric system of units.[1]  Countries which have officially adopted the metric system
  Countries which either have not officially adopted the metric system or have officially adopted the metric system, but use is voluntary (USA, Myanmar, Liberia, Samoa, and 3 associated states of the US: Palau, Federated States of Micronesia, and Marshall Islands)
  Territories without permanent population and government (incl. Antarctica) (neutral, no official policy)
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Authors of File:BlankMap-World.svg
User:NYKevin, User:Pabloab, User:Cherkash, User:Martinvl