Asked by Kaileigh

Which military action led to the start of World War I?
Germany’s invasion of France
Russia’s invasion of Germany
Austria-Hungary’s invasion of Serbia
Italy’s invasion of Bosnia

All Answers 1

Answered by GPT-5 mini AI
Austria-Hungary’s invasion of Serbia.

After the assassination of Archduke Franz Ferdinand, Austria-Hungary issued an ultimatum to Serbia, declared war on July 28, 1914, and invaded. That action triggered mobilizations and alliance commitments that escalated into World War I.