Final answer:
The outbreak of World War I was sparked by the assassination of Archduke Franz Ferdinand. The war involved various events including invasions, alliances, and major countries joining the conflict.
Step-by-step explanation:
Subject: World War I
The question is about the events surrounding the outbreak of World War I. The assassination of Archduke Franz Ferdinand of Austria-Hungary in 1914 is considered the event that sparked the war. As a result, Austro-Hungary invaded Serbia, leading to Russia's support of Serbia and France's support of Russia. Germany counterattacked Russia in the East and invaded Belgium to get to France. The involvement of the United States, invasion of Russia, British involvement, and Russian involvement were significant events during the war as well.
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