The event marked by the start of the Bolshevik Revolution was the October Revolution of 1917. Taking place in Russia, this revolution was led by the Bolshevik Party, headed by Vladimir Lenin, who sought to overthrow the Provisional Government established after the abdication of Tsar Nicholas II. The revolution was driven by widespread dissatisfaction with economic hardship and war. Following a successful coup, the Bolsheviks established a socialist government, which led to the withdrawal of Russia from World War I and initiated a series of radical changes, influencing subsequent communist movements worldwide.