What event led to the start of world war 1
- What event triggered the start of world war 1
- What event ultimately led to the start of world war 1
- What major event led to the start of world war 1
- What major event led to the start of world war 1 in europe
- What event led immediately to the start of world war 1
- In 1939 what event led to the start of world war ii
- What event led to the outbreak of world war 1
- What event led to the beginning of world war 1
- What event led to the immediate outbreak of world war 1
- What was the event that sparked the start of world war 1
- What event marked the start of world war 1
- What event led to world war 1
- Which event directly leads to the start of world war 1
- What single event led to the outbreak of world war 1
- What event triggered the events that led to the start of world war i in 1914