Based largely on primary sources, this article concentrates on the Liberal administration led by Count Romanones between December 1915 and April 1917. This is regarded as a crucial moment in the country's transition from elite to mass politics. The social and economic impact of the First World war brought about massive economic dislocation and social distress that in turn generated unprecedented levels of popular mobilization against the regime. Intertwined with domestic uproar, the country was polarized by the question of neutrality. Alienated from the ruling classes by his pro-Allied stance, Romanones was not only the target of a fierce campaign to oust him but also presided over the acceleration of existing movements of social and political protest. At his fall in April 1917, he left behind a storm of discontent and turmoil that threatened to bring down the entire political order.