Fundamental book on the history of Spain, if you want to know in depth the causes pointed out by some investigators on the causes that triggered the Spanish Civil War, at least from the point of view of the experts who point out that this conflict had fundamentally social. The history of the war is very varied, highlighting the fiery defense of its interests on the part of both the upper and lower social classes, although other key factors in understanding the conflict, such as Recurrent interventionism of the army. This is because I have considered it of greater interest to study the elements related to the most disadvantaged classes of Spain at that time, putting special interest in the South of Spain (especially Andalusia). For this new edition I have corrected the grammatical and orthographic errors that characterized up until now my book dedicated to the study of anarchism in Spain from its earliest years, in the form of organized workers' struggle.