What event is considered the beginning of world war 1
- What event caused the beginning of world war 1
- What event is considered the start of world war 1
- What event is considered the spark of world war 1
- What event is considered the immediate cause of world war 1
- What event sparked the beginning of world war 1
- What event marked the beginning of world war 1
- What event triggered the beginning of world war 1
- What event marked the beginning of world war 11
- What event sparked the beginning of world war 1 in europe
- What event is generally considered the cause of world war 1
- What event led to the beginning of world war 1
- What event is often considered the immediate cause of world war 1
- What event in 1914 triggered the beginning of world war 1
- What event marked the beginning of world war two 1939 not pearl harbor )
- What event is considered the spark that ignited world war 1