The slogan "4 + 3 = 1" is used to promote the unification of these people. Soldiers of this ethnicity surrendered to the Italians in the Santona Treason, and a terrorist group associated with these people attacked a nuclear power station at Lemoiz. These people were represented by the now-outlawed (*) Batasuna party. Mark Kurlansky's history of this people traces their control of the cod fishing industry. These people traditionally live between the Ebro and Adour rivers. A group advocating for their independence was erroneously blamed for the 2004 train bombings in Madrid and goes by the name ETA. For 10 points, name 
The slogan "4 + 3 = 1" is used to promote the unification of these people. Soldiers of this ethnicity surrendered to the Italians in the Santona Treason, and a terrorist group associated with these people attacked a nuclear power station at Lemoiz. These people were represented by the now-outlawed (*) Batasuna party. Mark Kurlansky's history of this people traces their control of the cod fishing industry. These people traditionally live between the Ebro and Adour rivers. A group advocating for their independence was erroneously blamed for the 2004 train bombings in Madrid and goes by the name ETA. For 10 points, name this ethnic group, divided between France and Spain, that speaks a language unrelated to any others.
The slogan "4 + 3 = 1" is used to promote the unification of these people.
Basques [or Vasco; or Vascongado Basque; or Euskaldunak; or Euskotarak; prompt on "Spanish" before Spain is mentioned in the giveaway]