Khan Academy
Khan Academy: Empires Before World War I
Sal Khan gives a video tutorial on the causes of WWI focusing on the empires and imperialism in the early 1900's. [7:36]
Crash Course
Crash Course World History 209: How World War I Started
Crash Course video in which host John Green takes on the complex question of how World War I got started and explains the events leading up to the war. [9:09]
Tom Richey
Tom Richey: Causes of World War I
U.S. History video in which Tom Richey sums up the main causes of World War I which include Militarism, Alliances, Imperialism, and Nationalism, leading to the assassination of Archduke Franz Ferdinand. [16:43]
Khan Academy
Khan Academy: The Beginning of World War I: German & Italian Empires in 1914
A video which gives a general overview of World War One's Italian and German Empires in 1914.