What fought in world war 1
- What countries fought in world war 1
- What country fought in world war 1
- What two sides fought in world war 1
- What states fought in world war 1
- What sides fought in world war 1
- What countries fought in world war 11
- What nations fought in world war 1
- What continents fought in world war 1
- What generation fought in world war 1
- What countries fought in world war 1 list
- What people fought in world war 1
- What countries fought in world war 1 and 2
- What president fought in world war 1
- What two countries fought in world war 1
- What two groups fought in world war 1