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1914
June 28: Assassination of Archduke Franz Ferdinand in Sarajevo.
July 28: Austria-Hungary declares war on Serbia; World War I begins.
August: Germany invades Belgium and France; the United Kingdom joins the war. -
1915
Germany intensifies submarine warfare, sinking the Lusitania.
Russia suffers defeats against Germany on the Eastern Front. -
1916
Battle of Verdun and Battle of the Somme, two of the war’s bloodiest battles. Discontent grows in Russia due to war losses and economic crisis. -
1917 - Russian Revolution
February: February Revolution in Russia; Tsar Nicholas II abdicates, and a Provisional Government is established.
April: Lenin returns to Russia and publishes his April Theses.
July: Failed Bolshevik coup attempt.
October: October Revolution: Bolsheviks, led by Lenin, seize power. -
1918
March 3: Russia signs the Treaty of Brest-Litovsk, withdrawing from World War I.
July: Tsar Nicholas II and his family are executed.
November 11: End of World War I with the armistice.
Beginning of the Russian Civil War between Bolsheviks (Reds) and anti-Bolsheviks (Whites). -
1919
June 28: Treaty of Versailles is signed, imposing harsh penalties on Germany.
The Bolsheviks strengthen control over Russia. -
1920
The main conflicts of the Russian Civil War come to an end. -
1921
March: Lenin introduces the New Economic Policy (NEP).
The Russian Civil War ends, consolidating Bolshevik power.