What was a key factor that aided the spread of fascism throughout spain during its civil war?

Through the conquest of territory

Explanation:

Fascism in Spain took shape in the Falange, a political formation that adopted various acronyms after successive mergers with other political forces: the original Spanish Falange, co-founded by José Antonio Primo de Rivera on October 29, 1933; a few months later, on February 15, 1934, Falange Española and de las JONS, after merging with the National-Syndicalist Offensive Boards of Ledesma Ramos and Onésimo Redondo; and finally, the Traditionalist Spanish Falange and Franco's JONS after merging with the Carlist traditionalists during the Civil War period.

the answer is true sir