The Russian Revolution of 1917 refers to a series of two popular revolutions in Russia, and the events surrounding them. These revolutions had the effect of completely changing the nature of society within the Russian Empire and transforming the Russian state, which ultimately led to the replacement of the old Tsarist autocracy with the Soviet Union.
The February Revolution of 1917 (March 1917 of the Gregorian calendar) was a spontaneous popular revolution focused around Petrograd, with an associated mutiny of the military. In the chaos members of the Duma assumed control of the country, forming the Russian Provisional Government. The army leadership felt they did not have the means to suppress the revolution and Tsar Nicholas II of Russia, the last Tsar of Russia, abdicated, effectively leaving the Provisional Government in power. The Soviets (workers' councils) which were led by more radical socialist factions initially permitted the new government to rule but insisted on a prerogative to influence the government and control various militias. The February Revolution took place in the context of the First World War, with much of the army in a state of mutiny.
...that the Russian Empire was a natural successor to the Tsardom of Russia. Though the empire was only officially proclaimed by Tsar Peter I following the Treaty of Nystad (1721), some historians would argue that it was truly born when Peter acceded to the throne in early 1682?
...that Napoleon made a major misstep when, following a dispute with Tsar Alexander I, he launched an invasion of the tsar's realm in 1812. The campaign was a catastrophe. Although Napoleon's Grande Armée made its way to Moscow, the Russians' scorched-earth strategy prevented the invaders from living off the country?
...that the emancipation of the serfs in 1861 was the single most important event in 19th-century Russian history. It was the beginning of the end for the landed aristocracy's monopoly of power. Emancipation brought a supply of free labor to the cities, industry was stimulated, and the middle class grew in number and influence; however, instead of receiving their lands as a gift, the freed peasants had to pay a special tax for what amounted to their lifetime to the government, which in turn paid the landlords a generous price for the land that they had lost?
...that the failure of the Russian armed forces in the Russo-Japanese War (1904–1905) was a major blow to the Tsarist regime and increased the potential for unrest. In January 1905, an incident known as "Bloody Sunday" occurred when Father Gapon led an enormous crowd to the Winter Palace in Saint Petersburg to present a petition to the tsar. When the procession reached the palace, Russian Imperial Army opened fire on the crowd, killing hundreds. The Russian masses were so aroused over the massacre that a general strike was declared demanding a democratic republic. This marked the beginning of the Russian Revolution of 1905?