How many countries are there in the world war 1
- How many countries was in world war 1
- How many countries involved in the world war 1
- How many countries participated in the world war 1
- How many countries fought in the world war 1
- How many countries are included in world war 1
- How many countries were there before world war 1
- How many countries were there during world war 1
- How many countries fought in world war 1 and 2
- How many countries participated in world war 1 and 2
- How many countries did world war 1 involve
- How many countries before world war 1
- How many new countries were there in europe after world war 1