Which of these was directly responsible for the outbreak of World War I in Europe?
unrestricted submarine warfare
colonial independence movements
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Entangling alliances, definitely.
Austria-Hungary provoked a war with Serbia, Serbia's buddies in Russia began mobilizing to protect them, and Germany jumped in with its own mobilization to protect their friends, and so on. It was a huge mess.
Granted, Austria-Hungary provoked Serbia after it was discovered that it was a Serbian assassin that was responsible for killing Archduke Franz Ferdinand.