UPDATED CLAIMS:

United Kingdom of Great Britain and Ireland: [@The Grey Warden], Second Order GM
Austria-Hungary:  [@Murtox]
German Empire: [@duck55223]
French Empire: [@Dedonus]
Russian Empire: [@The Nexerus], Second Order GM
United States of America: [@Byrd Man]
Ottoman Empire: [@Theodorable]

Continental Powers:

China: [@Chairman Stein], Second Order GM
Japan: [@Ryu]
Spain:
Portugal:
Belgium:
Italy: [@LordZell]
Sweden: [@Boop_Im_A_Dragon]
Denmark: [@Lone Wanderer]

Regional Powers:
Netherlands:
Argentina:
Serbia:
Romania:
Bulgaria:
Greece: