Answer:
Cause:
-militarism
-alliances
-imperialism
-nationalism
Effect:
-8.5M soldiers and 13M civilians died
- Four imperial dynasties collapsed as a result of the war: the Habsburgs of Austria-Hungary, the Hohenzollerns of Germany, the sultanate of the Ottoman Empire, and the Romanovs of Russia.
-intense hardship with no end in sight
-World War II was a direct outcome of the harsh treatment imposed by the peace treaty that ended World War I.