I AM MARKING BRAINLEST IF YOU CAN PLEASE HELP ME How did the assassination of Archduke Franz Ferdinand lead to the start of World War I?

The assassination led directly to World War I when Austria Hungary subsequently issued an ultimatum to the Kingdom of Serbia, which was partially rejected. Austria Hungary then declared war on Serbia, triggering actions leading to war between most European states.

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The murder of Archduke Franz Ferdinand outraged Austria-Hungary. ... Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28. Within days, Germany declared war on Russia—Serbia's ally—and invaded France via Belgium, which then caused Britain to declare war on Germany.

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