The president has called Ebola an international crisis and a threat to national security. Why is this disease considered a threa
t to national security? The disease travels across international borders when people travel who have it. The disease appears and disappears throughout history. The disease is killing many people in Africa. The disease is killing medical workers.
Which European countries established strong centralized monarchies during the late Middle Ages? Aragon, Castile, under Isabella and Ferdinand's rule established a strong centralized monarchy.
