Answer:
The murder of Archduke Franz Ferdinand of Austria had greater responsibility in the development in the first world war. His murder catapulted into a war across Europe that lasted until 1918.
I think this war did have the greatest impact in the history of the world because of the mass murders that occurred and the amount of money this war used; little over 200 billion dollars.
What the soldiers went through in the trenches were dreadful. The trenches were long ditches in the ground where the soldiers lived. It was very unsanitary and cause many physical health issues.
Step-by-step explanation:
Hope this helped! :))