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Archduke Franz Ferdinand and his wife was shot by Gavrilo Princip
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Austria-Hungary declared war on Serbia, and Russia, Belgium, France, and Great Britain joined the allies against Austria-Hungary and Germany.
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Germany invades France and Belgium and captured the city of Liege.
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Russia invades Germany in the eastern front, but stopped by at the Battle of Tannenberg. Germany won the battle.
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French and British invades German troops, making the German troops back to Germany. France won the quick battle.
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British Grand Fleet attacked German Marine in the North Sea.
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British and French troops invading the Ottoman Empire in the western front. The allies won the battle.
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A German U-boat torpedoed the British-owned steamship Lusitania, killing 1,195 people including 128 Americans
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Italians attacking the Austrians to control Isonzo River at the Adriatic Sea. Germany joined the Austrian troops, and Italy retreat and lost multiple battles
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The allies fight back the Germans on the Western front and Somme River in France. British forces attempted fight German trenches and gunned down.
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Longest single battle in WWI for nearly 1 year. French Army was attacked by the Germans, both sides lost the battle, with more than 600,000 deaths in the battle.
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Germany sent a coded telegram to Mexico, to make alliance with Mexico and Japan, without being intercepted by British intelligence. Germany promised to give Mexico back its original territory from 1836.
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Russia can't go through German lines and lost their population. Vladimir Lenin took the power of the country and supported the Central Powers after the revolution.
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Russia give its territories: Finland, Estonia, Latvia, Lithuania, Poland, and Ukraine to Germany to increase German success.
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Romania signed the treaty with the Central Powers to return Bessarabia to Austria-Hungary and give oil to Germany.
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(Event changed) After the treaty and the telegram, Romania, Russia, Mexico, and Japan joined the Central Powers and declared war on the allies. Mexico started invading the US.
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After invasion by Mexico, US declared war against the Central Powers by starting second Mexican American War.
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After US won the second Mexican American War, US gained control of the entire Mexico and later enter Europe to fight against Germany and other countries in the Central Powers. Japan rejoined the allies.
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Germans strike ally troops in the Marne River to attack them. The trenches broke, and French and American troops counterattacked Germany, making the Germans lose the battle, and allied troops entered Austria-Hungary and Germany.
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After the allies won against Germany and Austria-Hungary, they declared war against Russia, Romania, Bulgaria, and Ottoman Empire. Many countries joined the Allied Powers after the victory of the battle.
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After the battle in Eastern Europe, the allies won the war in WWI and the end of the Central Powers. The Central Powers countries signed the treaty and gain weaker, and lots of small nations got independent.
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Germany and other Central Power countries are no longer control their territories. US is making Mexico independent again.