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June 28,1914- Archduke Ferdinand is assassinated while visiting Sarajevo amid reports of anti-Austrian sentiment and unrest.

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June 28,1914- Archduke Ferdinand is assassinated while visiting Sarajevo amid reports of anti-Austrian sentiment and unrest.

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Franz Ferdinand, the heir to the Austria-Hungarian throne, travels to Sarajevo, Bosnia, to meet his future people and share his moderate political ideas. To put an end to Austria-Hungarian authority in Bosnia, a Serb called Gavrilo Princip and his terrorist organization, Black Hand, kill him.

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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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By using the assassination as justification, Austria sends Serbia a severe ultimatum that, if accepted, will prevent war. Austria demands Serbia halt anti-Austrian terrorism, punish Serbian officials involved in the assassination, and permit Austria to participate in the investigation. Austria does this with the backing of Germany's "blank check" and its encouragement to fight.

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July 24, 1914 - Serbia accepts most but not all of Austria’s demands.

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July 24, 1914 - Serbia accepts most but not all of Austria’s demands.

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Serbia accepts the majority of the demands and wants to hold an international conference to address the remaining issues since it is aware that defying the ultimatum would trigger a war.

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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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Despite the fact that the Austrian army is not equipped to fight, Austria declares war due to the fact it is unwilling to negotiate with Serbia regarding the ultimatum.

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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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When Serbia turns to Russia for assistance, Tzar Nicolas II telegraphs Kaiser Wilhelm II to persuade Austria to relax its demands. Russia decides to mobilize and move its troops to the Austrian border when this appeal is rejected. Russia is plainly refusing the request from Germany to withdraw.

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July 31, 1914 - Germany demands that France stay neutral, but France backs its ally, Russia.

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July 31, 1914 - Germany demands that France stay neutral, but France backs its ally, Russia.

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France becomes Russia's source of help. The potential to seek revenge for France's loss in the Franco-Prussian War is also seen as important by Parisians. France decides to back Russia and join the conflict despite hesitation and ignores German requests for it to be avoided.

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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 mobilizes while France mobilizes in support of Russia. Germany decides to go to war with Russia in response.

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August 3, 1914 - Germany responds by declaring war on France.

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August 3, 1914 - Germany responds by declaring war on France.

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France declines to remain neutral, therefore Germany declares war on it. This choice advances a former German general's plan for a two-front conflict with France and Russia.

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August 4, 1914 - German army invades Belgium on its way to France.

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August 4, 1914 - German army invades Belgium on its way to France.

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In order to implement the Schlieffen Plan, which was created in the past by General Alfred von Schlieffen, Germany invades Belgium. Germany's location makes a two-front war with France and Russia quite likely. As a result, the strategy directs Germany to swiftly destroy France before turning to Russia. The Schlieffen Plan instructs German soldiers to march through neutral Belgium before heading south behind French lines to encircle and subdue the French army. This will guarantee German victory in France. Germany invades Belgium as a result.

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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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Previously, a convention guaranteeing Belgium's neutrality had been signed by Britain and other European powers. Britain therefore declares war on Germany. Along with helping Belgium, Britain also utilizes this conflict to address its rising animosity with Germany over their rivalry in industry and power.