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June 28, 1914- Archduke Ferdinand is assassinated while visiting Sarajevo.

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June 28, 1914- Archduke Ferdinand is assassinated while visiting Sarajevo.

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Archduke Francis Ferdinand who was disliked by many, visited Sarajevo, during which Bosnia was under Austria-Hungary rule. It was home to many Serbian nationalists. Members of the Serbian terrorist group known as the Black Hand orchestrated the assassination. Gavrillo Princip shot him in his car.

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July 23, 1914 - Austria presents Serbia with an ultimatum, backed by Germany.

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July 23, 1914 - Austria presents Serbia with an ultimatum, backed by Germany.

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Germany gave Austria a “blank check” or a promise of unconditional support. Austria sent Serbia an ultimatum to avoid war, Serbia must end all anti-Austrian agitation and punish any Serbian official involved in the murder plot.

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July 25, 1914 - Serbia accepts most but not all of Austria’s demands.

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July 25, 1914 - Serbia accepts most but not all of Austria’s demands.

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Serbia agreed to most of the demands and agreed to allow an internal conference to settle the others.

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July 28, 1914 - Austria rejects Serbia’s offer and declares war on Serbia

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July 28, 1914 - Austria rejects Serbia’s offer and declares war on Serbia

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Austria- Hungary did not want to negotiate and declared war.

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July 30, 1914 - Russian leaders order mobilization of troops and move them toward the Austrian-border. Tzar Nicolas II tells Kaiser Wilhelm II that the moves are only a precaution.

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July 30, 1914 - Russian leaders order mobilization of troops and move them toward the Austrian-border. Tzar Nicolas II tells Kaiser Wilhelm II that the moves are only a precaution.

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Russia (Serbia’s ally) urged Austria to soften its demands but failed. Russia began to mobilize and prepare its military forces for war.

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August 1, 1914 - Germany declares war on Russia.

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August 1, 1914 - Germany declares war on Russia.

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Germany responded by declaring war on Russia.

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August 3, 1914 - Germany demands that France stay neutral, but France backs it ally, Russia.

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August 3, 1914 - Germany demands that France stay neutral, but France backs it ally, Russia.

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Russia appealed to its ally France. Germany demanded France to keep out of the conflict, but France refused.

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August 3, 1914 - Germany declares war on France.

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August 3, 1914 - Germany declares war on France.

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Germany then declares war on France after they refused to keep out of the conflict.

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August 3, 1914 - German army invades Belgium on its way to France.

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August 3, 1914 - German army invades Belgium on its way to France.

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Germany designed the Schlieffen Plan to avoid a two front war. The plan required German armies to march through neutral Belgium and swing south behind French lines. They wanted to encircle and crush France’s army.

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August 4, 1914 - Great Britain, honoring a treaty guaranteeing Belgium’s neutrality, declares war on Germany.

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August 4, 1914 - Great Britain, honoring a treaty guaranteeing Belgium’s neutrality, declares war on Germany.

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Britain and other European powers signed a treaty guaranteeing Belgium neutrality. Great Britain was enraged and declared war on Germany.