https://www.britannica.com/topic/mandate-League-of-Nations - Encyclopedia Britannica describes the Mandate from the League of Nations after World War One ended, and how the various countries were split amongst the allied powers as well as the justification behind this.
https://www.youtube.com/watch?v=YXqppJ-L88U –All Histories provides a basic overview of the timeline of World War One. This clip gives a detailed explanation of the order in which World War One occurred. It covers when countries became involved, what casualties they faced, as well as the geographic outcomes of the war.
https://www.youtube.com/watch?v=KOK1TMSyKcM Simple History explains the Russian Revolution, encompassing all of the various parties involved in the revolution as well as a timeline of events that occurred.
https://www.youtube.com/watch?v=o1IFePaNENQ –Khan Academy analyzes the Paris Peace Conference, the Treaty of Versailles, and the closing of World War One.