対華21カ条要求
At the request of the Emperor, Ōkuma returned to politics during the constitutional crisis of 1914, when the government of Yamamoto Gonnohyōe was forced to resign in the wake of the Siemens scandal. Ōkuma organized his supporters, together with the "Rikken Dōshikai" and "Chūseikai" organizations, into a coalition cabinet. The 2nd Ōkuma administration was noted for its active foreign policy. Later that year, Japan declared war on the German Empire, thus entering World War I on the Allied side. In 1915, Ōkuma and Katō Takaaki drafted the Twenty-One Demands on China.