The greatest Impact of world war1 was high number of casualties. How far do you agree?

The greatest Impact of world war1 was high number of casualties. How far do you agree?
I agree that the greatest impact of world war was 'high number of casualties' because a lot of innocent lives were lost.
• High number of casualties
-Over 18 million fighting men was killed and about 9 million civilians (publics) died as a result of war. More men had been wounded than killed in the forces .Many soldiers escaped physical injury, returned home with psychological problems caused by war.
Lives cannot be replaced and most of those who died are innocent people. Some that survived must have had vivid vision of what had happened and had been traumatized by the incident. --The number of people who was killed is a lot and those who were involved in the war are probably not able to sleep at night. Germany had the highest number of deaths compared to Russia(1,700,000), France(1,358,000), Austria-Hungry(1,000,000), Great Britain(761,213), Italy(460,000), Turkey(375,000), British Empire(251,000), and USA(114,095).
However, there are other factors in the impact of world war1
• Cost
After war ended, Britain, France and Germany were facing huge debts. The governments had spent over £40 000 million fighting the war. They had borrowed money from USA and raised taxes to be in much debt. US were less affected because it did not enter the war until 1917 and no fighting took place on US soil.
• Damage
France suffered most physical damage since most of the fighting took place there.2000 square miles of forest and 8000 square miles of agricultural land laid waste. Over 1000 factories and a quarter of a million other buildings were destroyed. Merchant shipping had been badly affected with over 13 million tones of ships destroyed