Just for conciseness, lets note that there's no evidence that the outbreak of the First World War had anything to do with Zionism. It occurred because the Slavophiles in Russia, who had many times previously shown themselves to be against all attempts to modernize the Czarist state, maneuvered Nicholas II into launching a half-mobilization of the Russian army in support of Serbia against Austria-Hungary. Slavophilism was an ideology which attempted to pose the Russian monarchy as the defender of the general interests of the Slavic peoples. This ideology was typically used as an ideological cover for those within Czarist Russia's feudal class who were opposed to efforts at modernization such as some other officials in the Czarist government had tried promoting. When Russia began its half-mobilization this immediately left Germany's military with its Schlieffen Plan no alternative but to launch full mobilization and advance ahead to a full war on two fronts with war in the west against France being carried out initially before the later war against Russia which would follow. One needn't approve of any of the later behavior of Zionist groups in order to recognize that there is absolutely no evidence that these central triggering factors of the First World War had nothing to do with Zionism and there is no basis for saying that Zionism was behind the First World War.