111 years ago today, June 28, 1914 (May 6, 1914, lunar calendar), the Sarajevo Incident. Archduke Franz Ferdinand of Austria just stepped off the train Archduke Franz Ferdinand of Austria (December 18, 1863-June 28, 1914). On June 28, 1914, the assassination of Archduke Franz Ferdinand, Crown Prince of the Austro-Hungarian Empire, in Sarajevo was the trigger for the First World War. Ferdinand was a fanatical militarist who advocated annexation of Serbia. In June 1914, the Austro-Hungarian Empire held a military exercise in neighboring Bosnia with Serre Sumiye as an imaginary enemy. Ferdinand and his princess personally reviewed it. This is a blatant provocation against Serbia. After the exercise, when Ferdinand arrived in Sarajevo, the capital of Bosnia, he was stabbed to death by Serbian patriotic youth Principo. The Austro-Hungarian Empire decided to use this as an excuse to provoke war and annex Serbia. When war was imminent, various imperialist countries were nervously engaged in conspiracy activities and preparing to fight. Kaiser Wilhelm II shouted crazily: "This is a once-in-a-lifetime opportunity!" After obtaining France's support, the Austria-Hungarian Empire put forward extremely harsh conditions to Serbia on July 23, limiting the signing and resumption within 48 hours. In order to endure humiliation and seek perfection, Serbia was forced to accept all other conditions except Austria sent personnel to participate in the pursuit and trial of the murderer. Despite this, the Austro-Hungarian Empire officially declared war on Serbia on July 28 on the pretext of not receiving a satisfactory answer. On July 30, Russia announced general mobilization. Germany's demand for Russia to stop its general mobilization was rejected, so it declared war on Russia on August 1. On August 3, Germany declared war on France again. On August 6, the Austro-Hungarian Empire declared war on Russia. Japan took advantage of Germany's lack of time to look east to present an ultimatum to Germany, demanding that Germany hand over its occupation of Jiaozhou Bay to Japan unconditionally, but was rejected. On August 23, Japan declared war on Germany. In November, Turkey participated in the Allied War. Thus began the world-scale battle provoked by imperialism. Lenin pointed out: "Capitalism concentrates a large amount of land in the hands of individual countries and divides the last piece of land. If it wants to divide it up and expand the territory, it can only sacrifice others and sacrifice another country for one country. The only way to solve this problem is to use force, so war between the world's predators is inevitable." This was the root cause of the First World War. Archduke Franz Ferdinand and his wife Hitler hailed the outbreak of war in the crowd. Berliners read news of the war crisis.