Russia
Russia. :)
Russia and Germany lost land also the austro Hungarian empire and the ottoman empires broke up into a collection of smaller countries.
Russia lost what is now know as Latvia finnland and Estonia russia lost 25%of its land and 33% of its population
If you are talking during the first world war then the only people who lost land were France and Russia I think and definetly Serbia which was conquered by austri-Hungary However post world war Germany lost land due to the treaty of versaille as well as Austria-Hungary
After World War 1, more than half of Russia's West Coast was lost. It became the new countries of Poland, Finland, Latvia, Lithuania and Estonia.
Russia lost to the Germans at Tannenberg in World War I.
Russia-nova net answer :P
Its not what they wanted to do it is what they to get back , because how China and Russia have lost their land back in WWI.So they wanted to get thier land back from what they have lost.
According to me the Germans lost the most land post in WW1 because in the end the central powers were defeated by the allied powers which had been consisted of Russia Italy France England USA & Japan.
The U.S lost the least land
Russia .