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October Revolution in Russia
On November 7 (October 25, old style) 1917, the Bolsheviks under Lenin seized power in Petrograd. This event split the world into two camps and defined the history of the 20th century — the Cold War, communism, geopolitics.
History
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February Revolution — end of the Romanov dynasty
In February 1917, mass unrest and military mutinies forced Nicholas II to abdicate. The 300-year Romanov dynasty ceased to exist. For the first time in Russian history, a republic was established.
History
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USA entered World War I — 1917
On April 6, 1917, the USA declared war on Germany, entering World War I. This tipped the war in favor of the Entente. President Wilson proclaimed a 'war for democracy', laying the foundations of American global leadership.
History