The causes of World War I, which began in central Europe in July 1914, included many intertwined factors, such as the conflicts and hostility of the four decades leading up to the war. Militarism, alliances, imperialism, and nationalism played major roles in the conflict as well. However, th...
It involved the vast majority of the worlds nations— luding all of the great powers—eventually formin o opposing military alliances: the Allies and the Axis. It was the most widespread war in history, and directly involved more than 100 million people from over 30 countries. In a state ...