Spain

Spain, officially the Kingdom of Spain, was a country in Europe prior to the Great War

Background
Spain, specifically its colonial empire, is mentioned in the Fallout intro and on the back of the Fallout Pen and Paper d20 guide. The Pillars of Hercules are mentioned in the Pioneer Scout exams.

Appearances
Spain is mentioned in Fallout, the Fallout 76 update Wild Appalachia, and Fallout Pen and Paper d20.