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  1. United States enters the war (April 1917) Nivelle Offensive and French Army mutinies (April–June 1917) Sinai and Palestine campaign (1917–1918) German spring offensive (March–July 1918) Hundred Days Offensive (August–November 1918) Battle of Albert. Allied advance to the Hindenburg Line.

  2. US President Woodrow Wilson announces the break in official relations with the German Empire in an address to the US Congress on February 3, 1917. The United States entered into World War I in April 1917, more than two and a half years after the war began in Europe. Apart from an Anglophile element urging early support for the British and an ...

  3. Revolutions of 1917–1923. The aftermath of World War I saw far-reaching and wide-ranging cultural, economic, and social change across Europe, Asia, Africa, and even in areas outside those that were directly involved. Four empires collapsed due to the war, old countries were abolished, new ones were formed, boundaries were redrawn ...

  4. This list of military engagements of World War I covers terrestrial, maritime, and aerial conflicts, including campaigns, operations, defensive positions, and sieges. Campaigns generally refer to broader strategic operations conducted over a large bit of territory and over a long period of time.

  5. Aviation in World War I. Colour Autochrome Lumière of a Nieuport Fighter in Aisne, France 1917. World War I was the first major conflict involving the large-scale use of aircraft. Tethered observation balloons had already been employed in several wars and would be used extensively for artillery spotting.

  6. The Eastern Front or Eastern Theater of World War I ( German: Ostfront; Romanian: Frontul de răsărit; Russian: Восточный фронт, romanized : Vostochny front) was a theater of operations that encompassed at its greatest extent the entire frontier between Russia and Romania on one side and Austria-Hungary, Bulgaria, the Ottoman ...

  7. The First World War lasted from 1914 to 1918. It was caused by the buildup of tension between countries. The three long-term causes were the formation of empires, the accumulation of armies and weapons, and alliances. The trigger cause was the assassination of Archduke Franz Ferdinand . One of the causes of World War I was that countries wanted ...