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Archduke was killed in Sarajevo. It was the trigger of the war.
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Begin of the World War was the invation of Belgium by the Germans.
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The Germans first used chemical warfare by filling their fire shells with chlorine gas. They use it against the French lines at lets them collapse.
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Lusitania was sunk by a German submarine. It was a English passenger liner that was sailing under a American flag. 1198 people were killed also American passengers.
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To keep the US out of the war the Germans restricted their submarines so that they didn't sink passenger and civilian ships any longer. That was a reaction to the sinking of the Lusitania by Kaiser Wilhelm
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Telegramm from German Zimmermann to Mexico that was intercepted by British intelligence telling the Mexicans to start war against the US and that Germany would help them in case of a war.
It was the reason for the United States to join the war. -
The US declare war against Germany. They joined Britain and France.
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Peace treaty signed by Germany and Russia gives Germany a lot of land in today's Poland and Ukraine. Because of the treaty the Germans could shift troups to the West front.
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There was an Armistice signed in France which declared the end of World War 1
