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Russian Revolution, two revolutions in 1917, the first of which, in February (March, New Style), overthrew the imperial government and the second of which, in October (November), placed the Bolsheviks in power. (Read Leon Trotsky’s 1926 Britannica essay on Lenin.) Centuries of virtually unchecked Russian expansion in Asia ended with an embarrassing defeat in the Russo-Japanese War (1904–05). This military reverse shattered Russia’s dreams of establishing hegemony over the whole of Asia, but it also...