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The archduke of Austria-Hungary was assassinated by Gavrilo Princip.
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Shortly after the Assassination of the Archduke Austria declared war on Serbia. Event is significant because war is starting.
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Germany invades Belgium so the UK defends them. Event is significant because this is one of the lead-up wars.
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Germany sets up a submarine blockade even where neutral merchant vessels couldn't pass. Event is significant because GB won't get supplies.
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Intending to secure it, Russia's allies Britain and France launched a naval attack followed by an amphibious landing on the peninsula with the eventual aim of capturing the Ottoman capital of Constantinople (modern-day Istanbul). Event is significant because this brings the Ottoman Empire into the war.
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Russia's army is now controlled by someone different. Event is significant because Russia's military is controlled by someone completely different and will be harder to use.
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Bloodiest most deadly battle. Event significant because it was the longest war of WW1.
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Germany tries to get Mexico to join the war on their side. Event significant because Mexico might enter the war.
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Russia ignss a peace treaty between them and the Central Powers. (Event significant because Russia leaves the war.
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One of the peace treaties at the end of World War I. It ended the state of war between Germany and the Allied Powers.