John Vasquez’s book adds to the enormous mass of writings on the outbreak and spread of the First World War, with the centenary of the outbreak of the First World War having stimulated a further raft of historical scholarship.[1] Vasquez makes a fresh contribution to the subject, but investigates it anew using the tools of political science, and asks a very different question: how do wars—in general—spread? Using the First World War as an exemplary case study, he looks individually at each pair of countries that declared war on one another, not only during the July Crisis but also in the second and third waves of countries that entered the war in 1915-1916 and 1917-1918. Vasquez draws a sharp distinction between the outbreak and the spread of war, with his work focussing only on the latter, and he treats the First World War as beginning with the outbreak of a local war between Austria-Hungary and Serbia that subsequently spread across the globe.

Continue reading