 While the decrease was certainly related to World War I and the changes in political administration, emigration also was a major factor.In the immediate post World War I period, Istria saw an intense migration outflow.Pula, for example, was badly affected by the drastic dismantling of its massive Austrian military and bureaucratic apparatus of more than 20,000 soldiers and security forces, as well as the dismissal of the employees from its naval shipyard.