All of the following factors contributed to the outbreak of war in Europe in 1914 except Select one: the assassination of Archduke Francis Ferdinand. Balkan desire for independence. the complicated defense alliances. European imperial ambitions. the sinking of the Lusitania.

The main cause of the war, was the Assassination of Arch Duke Franz Ferdinand. The sinking of the Lusitania only cause the U.S. to enter and help the British and French.

Explanation:

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.