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July 28 - Austria-Hungary declares war on Serbia, marking the start of World War I.
August: Germany declares war on Russia and France and invades Belgium.
August 4 - Britain declares war on Germany, turning World War I into a global conflict.
September 5 - The Battle of the Marne begins and the Germans are repelled. -
22 April: The Germans use poison gas as a chemical weapon for the first time in the Flanders region.
May 7: The German submarine Lusitania is sunk, prompting international condemnation. -
July 1 - The Battle of the Somme begins, becoming one of the bloodiest battles of the First World War.
23 July: The Germans use poison gas in the Battle of Verdun. -
The United States entered World War I and declared war on Germany.
The February and October Revolutions in Russia led to the end of tsarism and the establishment of Soviet power. -
November 11 - World War I ends with the surrender of Germany.
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The Paris Peace Conference was convened to deal with the aftermath of the war and establish a new international order.
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The economy was booming, jazz was popular, and the film and fashion industries were booming.
The social atmosphere is more open, and the status of women is gradually improving. -
The stock market crashed, triggering a global depression.
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As the Great Depression continued, governments around the world responded with different measures.
The international situation was tense and fascism was on the rise in Europe and parts of Asia. -
September 1 - Germany invades Poland and World War II begins
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Germany won major victories in Western Europe, including the occupation of most of France.
Britain successfully defended itself against German air attacks in the Battle of Britain.