World War I had several causes, which are usually summed up by four "MAIN" causes (Militarism, Alliances, Imperialism, Nationalism). In this lecture, Tom Richey discusses each of the "MAIN" causes and the assassination of Archduke Franz Ferdinand in Sarajevo.
(01:23) Militarism - The Anglo-German Arms Race, H.M.S. Dreadnought (06:27) Alliances - Bismarck's Alliance System, Triple Entente, Central Powers (08:46) Imperialism - an international forum for national rivalries (09:16) Nationalism - Serbian nationalism in the Austrian Empire (13:10) Assassination - Some people add an "A" at the end for the assassination of Franz Ferdinand
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. UK and Commonwealth OTL troop numbers in WW1