There was many kinds, depending on the nation.
The Empire that lost the most territory was Germany. Germany lost the city of Danzig, and its polish territory, Part of upper Silesia, Alsace-Lorraine territory, the Saar region, Schleswig region, and all of her overseas territory, which included Cameroon, Togo, German South-West Africa, German East-Africa, Part of New Guinea, And many pacific island, which are too numerous to name.
In WW1 it was Germany, and in WW2 I am not sure. Sorry hope this helps.
WW1
Germany's main allies were Austria-Hungary, Bulgaria and the Ottoman Empire.
Austria- Hungary
Germany lost it colonies in Africa and Asia.
Finland
The Soviet Union lost Finland, Estonia, Latvia, and Lithuania after World War I.
Before Germany invaded Poland in 1939 It only acquired what was taken from it as a result of loosing WW1. The victors WW1 did not find it to their advantage at the time to get involved in another war to hold on to these territory's. as they were still stugling with the aftermath of the great depression.
France lost Alsace and Lorraine just before ww1 and this could have been one cause of ww1! xx lots of love xx .......!!
Lithuania, latvia, estonia, finland, yugoslavia, czechloslovakia. several more but these are the main ones.
Effectively the revolution ends Russias' involvement as a beligerant in WW1. Therefore Russia, indirectly, becomes communist because of WW1, but Communist Russia was not part of it, surrendering a massive amount of territory as a result of the Treaty of Brest-Litovsk.
France
EGYPT!!!!!!!!!!!
There was many kinds, depending on the nation.
After Austria lost WW1 in 1918