Russia.
Russia suffered the greatest loss of life during World War I. There were thousands of casualties on all sides suffered during the war.
Weapons of mass destruction have never been used against the US. In fact, the US is the only country that has ever used an atomic bomb against another country and that was Japan during the second World War.
Germany
During World War I, it is estimated that around 7 to 10 million civilians lost their lives due to military actions, famine, and disease. The war's widespread destruction and the resulting hardships significantly impacted civilian populations, particularly in affected countries such as Belgium, Serbia, and the Ottoman Empire. Additionally, millions more were displaced or suffered from the consequences of the conflict.
Russia.
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Soviet Union.
A reparation is :Usually, reparations. compensation in money, material, labor,etc., payable by a defeated country to another country or to an individual for loss suffered during or as a result of war.
Russia suffered the greatest loss of life during World War I. There were thousands of casualties on all sides suffered during the war.
Russia suffered the most total casualties.But in terms of percentage of of military forces it was Austria-Hungary
Chile and Saudi Arabia suffered the most.
Russia suffered the biggest losses during WW1.