What was the spark of world war 1
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- What was the immediate cause or spark of world war 1 in europe
- What was the spark that started world war 1
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- What was the spark that began world war 1
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- What was the spark that triggered world war 1
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- What was the spark of the trigger that started world war 1
- What was the spark that ignited the start of world war 1
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