Why was Archduke Franz Ferdinand killed, thus leading to WWI?

At the time
of Archduke Franz Ferdinand's assassination, Serbia was technically independent, yet many Serbs
lived in Bosnia, Herzegovina, etc. In 1905, Austria had formally annexed Bosnia and Herzegovina,
over which Austria had previously held the right to "occupy and administer." This
annexation enraged Serbs throughout the Balkans, but little could be done. Later, a series of
wars broke out in which Austria intervened. As a result of the wars, Serbia was forced to cede
Albania to Austria. Austria, part of the Austro-Hungarian Empire, had hoped to use
its...