The assassination of Archduke Franz Ferdinand and his wife.
Answer:
Because it would upset the balance between free-states and slave-states, and went through the 36° 30' line, from the Missouri Compromise of 1820, thus it could not be solved easily.
It is governed by policies issued by the Department of Defense. The essential services provided by the support army forces include: providing rescue, providing emergency medical treatment, providing food and water, preventing epidemic diseases, providing emergency shelter, providing basic sanitation, etc.
