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 Scouts exams. The Cheyenne Mountain facility offers a Spanish language countdown. Dean Domino visited the country's capital of Madrid before the Great War, where he got himself into a difficult situation.

Appearances
Spain is mentioned in Fallout, the Fallout: New Vegas add-on Dead Money, the Fallout 76 update Wild Appalachia, Fallout Tactics, and Fallout Pen and Paper d20.