Correct answer:
A proxy war
The Spanish Civil War (1936-1939) brought Generalissimo Franciso Franco to power in Spain as the leader of a right-wing, authoritarian regime.
A "proxy war" means that the war is part of a larger conflict between world powers, and multiple countries become indirectly involved in the war.
In the case of the Spanish Civil War, fascist regimes such as that of Hitler in Germany and Mussolini in Italy gave support to Franco in Spain, while countries in support of freedom and democracy, such as the United States, aligned with those fighting against Franco.