The causes of WWI, which ranged from the crisis in the Balkans that set off the war to the tensions created by the alliance system and Germany's ambitions.
The course of the war on land and at sea, resulting in a stalemate for several years.
The withdrawal of the Russians from the conflict.
The United States' renunciation of neutrality and subsequent mobilization, which turned the tide against the Germans.
The collapse of the German empire and the establishment of the Weimar Republic.
The impact of the war on the role of government in national economies, and the increasing adherence to the idea of economic equality.
The shift in economic growth and influence globally as Europe suffered from inflation while the United States and other regions rapidly industrialized.
The sense of crisis in the ideals of progress and Western civilization provoked by the experiences of war.
Woodrow Wilson's dream of creating an international regulatory body to prevent future conflicts.
Allied demands of reparations and German resistance to such demands during the peace negotiations.
