The theme prominent is the death of a young man at the height of his strength and his career. Death of a young person is a common theme in poetry and this one is very famous because of the emotions that it awakens in a person. Poe was known for writing poems like this usually including young women who die before becoming old.
The U.S. Code of Federal Regulations defines terrorism as "the unlawful use of force and violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives"