What main countries fought in world war 1
- What countries fought in world war 1
- What countries fought in world war 11
- What countries fought in world war 1 list
- What countries fought in world war 1 and 2
- What two countries fought in world war 1
- What countries fought each other in world war 1
- What countries fought in world war 1 and what sides were they on
- What countries fought during world war 1