Source:
Click on the name of the site to go in it
"Allies of World War I - Wikipedia"
"World War I in Europe with Flags: Every Day - YouTube"
"A Primeira Guerra Mundial - Parte 2 - YouTube"
"[Inaccurate] The First World War in the Middle East - YouTube"
"Latin America | International Encyclopedia of the First World War (WW1)"
(And very other Wikipedia pages)
All images (Flags, Coat of Arms, Emblems, Seals and more) are from Wikipedia
Not only national or state flags/ensigns are used to represent the country, most countries on this list are represented by the civil, or naval flag/ensign (Like Greece or Siam, that are represented with the naval ensigns, even that this countries did have state flags like any other)
Site created by Daniboy0826