What event led to the outbreak of world war 1
- What immediate event led to the outbreak of world war 1
- What single event led to the outbreak of world war 1
- Which event led to the outbreak of world war 1 in europe
- What event sparked the outbreak of world war 1
- What event caused the outbreak of world war 1
- What event triggered the outbreak of world war 1
- What event sparked the outbreak of world war 1 in europe
- Which event led directly to the outbreak of world war 11
- Explain how this single event led to the outbreak of world war 1
- What event sparked the immediate outbreak of world war 1