What umayyad conquest expanded arab territory

The Umayyad conquest of Hispania was the initial expansion of the Umayyad Caliphate over Hispania, largely extending from 711 to 788. The conquest resulted in the destruction of the Visigothic Kingdom and the establishment of the independentEmirate of Cordova under Abd ar-Rahman I, who completed the unification of Muslim-ruled Iberia, or al-Andalus (756–788). The conquest marks the westernmost expansion of both the Umayyad Caliphate and Muslim rule into Europe.

Probably north korea if your family has decided to use only nuclear power.