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. During World War I, developments in military technology led to

(1) an early victory by the Allied powers
(2) the establishment of industrial capitalism
(3) the use of poisonous gas and submarine attacks
(4) an increase in ethnic tension in western Europe

User Heny
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1 Answer

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Answer:

3

Step-by-step explanation:

the use of poisonous gas and submarine attacks

User Sheki
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