What were the events leading to World War 1 that incudes nationalism imperialism and militarism?

A event that sparked the war was the assassination of Archduke of Austria-Hungary in 1914. Gavrilo Princip, a Serbian nationalist was responsible for the assassination. He believed Serbia should be independent from Austrian rule. Austria-Hungary later called war on Serbia which resulted in both Serbia and Austira-Hungary's alliances to join the war. Countries continued to join. The United States later entered the war for a different reasons such as the sinking of the Lusitania, the Zimmerman note etc.