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)