What event sparked the outbreak of world war 1
- What event sparked the outbreak of world war 1 in europe
- What event sparked the immediate outbreak of world war 1
- What event sparked the outbreak of world war ii in 1939
- What event sparked the outbreak of world war i in 1914
- What event caused the outbreak of world war 1
- What event triggered the outbreak of world war 1
- 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
- What event triggered the outbreak of world war i in 1914
- What event triggered the outbreak of world war 1 in 1914