How did the assassination of Archduke Franz Ferdinand directly cause World War I?
It resulted in other European nations being drawn into the conflict between
Austria-Hungary and Serbia due to their complex alliances.
It broadened into a wider conflict when the troops accompanying him attacked
the Serbian capital.
It caused a diplomatic break between Germany and Austria-Hungary and
ultimately the outbreak of hostilities between the two nations,
It led Britain and France to immediately declare war on Germany to quickly
mobilize and gain the advantage in the coming conflict.

It resulted in other European nations being drawn into the conflict between

Austria-Hungary and Serbia due to their complex alliances.

Explanation:

Serbia was allied to Russia, who was allied to France. This caused both the Russian Empire and France to join the war on Serbia's side. Austria-Hungary was allied to Germany, which brought Germany into the war. Other countries involved in World War One joined due to actions by the Central Powers or Entente, such as the invasion of Belgium or Black Sea Raid which got The United Kingdom and the Ottoman Empire involved respectively

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