Answer:
alliances, imperialism, militarism, nationalism
Explanation:
Alliances, imperialism, militarism, nationalism are the factor contributed to the outbreak of World War I. With the assassination of Archduke Franz Ferdinand of Austria-Hungary, the World War I started. The European nations experience massive casualties in the war due to advancing technology and weapons systems such as planes, tanks, machines guns, grenades, chemical weapons, submarines, etc. These new weapons cause great damage and leads to more casualties in the war.
