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Countries joined World War I due to a complex interplay of alliances, nationalism, and imperial ambitions. The assassination of Archduke Franz Ferdinand of Austria-Hungary triggered a series of alliances: Austria-Hungary declared war on Serbia, prompting Russia to support Serbia. Germany allied with Austria-Hungary, leading to Britain and France entering the war against the Central Powers due to their commitments to defend Belgium and their own alliances. Nationalistic fervor and the desire for territorial expansion further fueled the involvement of various nations.

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1w ago

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