Based on your knowledge of world war1, which event was the primary catalyst for world war 1?

The Assassination of Archduke Ferdinand of Austria and his wife Sophie.

While tensions between the Central Power (Austrio-Hungary, Ottoman Empire, Germany, and their colonies) and the Allied Powers (Almost the rest of the world, including Italy, which left the Central Powers) was extremely high because of the events surrounding the annexation of lands that both Serbia and Austrio-Hungary wanted. This led to the Assassination of the said couple, and with this, Austrio-Hungary found a reason to both declare war and try to take over Serbia. However, the Allies would not have any of this, and soon it set off a chain-reaction of declaration of wars, leading to the first, truly global war.

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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

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