- many people died.
- Many people contracted diseases due to the war.
- Mass starvation was experienced and most of the productive people were sent to war while land and crops were devastated as the war dragged on.
- Destruction of property.
- Huge sum of money were used on acquisition of war related equipments.
- USA emerged as word leading power.
- Led to alteration of boundaries of Europe.
- European domination of overseas colonies was eroded.
- It caused a lot of misery and suffering because of displacement which made many people refugees.
- It led to formation of the league of Nation to preserve international peace.
- Advancement in the art of surgery and medicine.