World War 1, the first of many industrialized wars, had many cuases. Imperialism, the alliance system, and militarism all created a political system that allowed the assassination of one person to plunge the world into war. The human and economic impact led to the worldwide Great Depression that would last until the start of World War 2.
|Central Powers||Allied Powers||Trench Warfare||Treaty of Versialles||Great Depression|
|New Weapons||Total War||Propaganda||Credit||New Deal|
|Franz Ferdinand||Bolsheviks||Karl Marx||Vladimir Lenin||Franklin Roosevelt|