Answer:
Go to yt and search "History of World War 1 (in One Take) | History Bombs"or "The cause of World War One! Origins: Rap Battle | WW1 Uncut - BBC" (Doesn't allow links)
Step-by-step explanation:
Both of the videos explain why and how the leaders fought against each other. They also explain the causes and effects of what caused and continued world war 1.