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Archduke Ferdinand is assassinated by a Serbian nationalist.
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One month after assassination of Archduke Ferdinand, Austria-Hungary declares war on Serbia, which begins the First World War.
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Germany declares war on Russia.
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Germany declares war on France, and invades neutral Belgium. Britain sent an ultimatum that was rejected by the Germans.
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The first British troops land in France.
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Great Britain and France declare war on Austria-Hungary. Serbia is also invaded by Austria-Hungary.
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The first major battle of World War I. Mons was a battle of movement instead of trench warfare.
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During a sea battle in the Pacific, the British Navy suffers its worst defeat in centuries.
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Germany declares the waters surrounding British Isles to be a war zone in which ships can be sunk w/o warning.
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The new leaders of the Ottoman Empire, spread propaganda against the Armenians. 200 Armenians were arrested and killed, the next three years, Armenians were driven out of their homes.
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Italy signs the Treaty of London, entering WWI on the side of the allies, Italy was only bound to defend its allies if one of them was attacked first.
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The British ocean liner Lusitania is torpedoed by a German submarine off the south coast of Ireland. The vessel sank into the Celtic Sea within 20 minutes.
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Was planned as a joint operation between British and French forces intending to break the deadlock on the Western Front. Because of German attack on the French, Britain and its Empire took the lead on the Somme.
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Britannic sinks in Aegean Sea. The ship intended to pick up more wounded soldiers near the Gulf of Athens, when it was then rocked by a violent explosion.
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The Battle of Rafa occurs near the Egyptian border with Palestine.
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German Foreign Secretary Arthur Zimmermann announces "Zimmermann Telegram" to be genuine. Generates support for the US declaration of war on Germany in April.
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The United States formally declared war against Germany and entered the conflict in Europe.
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The first American troops land in France.
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Japanese battle cruiser "Tsukuba" sunk by internal explosion in harbour.
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U.S. troops see western front for the first time.
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Pandemic influenza deaths in the U.S.
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Was a statement of principles for peace that was used for peace negotiations to end WWI.
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Flu Epidemic in Kansas, U.S.
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Fighting in WWI came to an end with the signing of an armistice between the Allies and Germany, it called for ceasefire.
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Took place a few months after the end of WWI, leaders from Allied nations began a series of discussions to settle issues raised by the war and its aftermath.
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Germany signed the Treaty of Versailles, officially ending its involvement in WWI.
