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On July 28, 1914, Archduke Franz Ferdinand was assassinated in Bosnia by Gavrilo Princip. This is what started WW1 because after the Archduke was assassinated France allied with Germany to get revenge on Serbia but Russia was allied with Serbia and they fought back. -
Austria-Hungary decided to declare war on Serbia because Archduke Franz Ferdinand was assassinated. This also started a lot of other alliances with Serbia or Austria-Hungary. -
on August 1, 1914, Germany declared war on Russia because Russia was allied with Serbia and Austria-Hungary was allied with Germany. When Austria-Hungary declared war on Serbia Russia started to prepare but Germany demanded that they stop preparing. Russia refused to stop so Germany declared war. -
On August 4, 1914, Great Britain declared war on Germany because Germany had invaded Belgium which was a neutral country, and refused to remove troops from Belgium when Great Britain asked. -
On September 6, 1914, the First Battle of the Marne started and ended on September 12, 1914. This battle is what first started the trench warfare in WW1 and it also stopped the German sweep into France. -
The Lusitania was a British boat that was torpedoed by German navy boats. The ship had both British people and Americans who all died because of the German U-boat -
On May 24, 1915, Italy declared war on Austra-Hungary and joined the Triple Entente which also opened up the Italian front in Italy bordering Austria-Hungary -
The Battle of Verdun started on February 21, 1916, and was the longest battle in WW1 ending on December 18, 1916. The battle was between the French and Germans and the French people were the ones who won the Battle of Verdun. -
On May 31, 1916, the Battle of Jutland started with the two sides being Great Britain and Germany. The Battle of Jutland was the largest naval battle in WW1 because of the 250 ships that were involved in the battle. -
The Battle of the Somme was one of the first major battles in WW1. The battle was between the French and British against the Germans. -
A German named Arthur Zimmermann sent a coded message to Mexico hoping to start an alliance against the United States. This was the final thing that made the United States join the war and declare war on Germany. -
The United States joined the war on April 6, 1917, because German submarines went after American boats after the Zimmerman Telegram. -
Russia dropped out of WW1 because a revolution started in Russia. Russia signed the Treaty of Brest-Litovsk which officially dropped them out of the war. -
On November 11, 1918, the Armistice was signed which stopped the fighting in WW1 and led to the end of WW1 The war lasted for 4 long years until the Armistice was signed. -
On June 28, 1919, The Treaty of Versailles was signed which officially marked the end of WW1. It also ended the state of war between Germany and a lot of the Allied Powers.