B. The crew of the Enola Gay was responsible for the order to drop the bomb.
From the states. It can't be enforced. The Congress needed the money to do things, but not all the states gave the money that the Congress needed.
Invasions by Barbarian tribes. ...
Economic troubles and overreliance on slave labor. ...
The rise of the Eastern Empire. ...
The most important reason for the collapse of Rome was the failure to actually integrate what they conquered. When Roman soldiers conquered new lands, it was rare that they ever attempted to force their culture, ideals, or laws upon the natives and barbarians. Thus, when the Empire began suffering internal struggles, the natives they had conquered decided to take action, which lead to the swift collapse by barbarian invasion from all sides. It's hard to pick a LEAST important reason, seeing that there were many of them, but I suppose a contender would most likely be the common refusal of the Empire to even acknowledge that barbarians were rising. On the outer edges of their territory, in places like Gaul and Morocco, the Roman government was reluctant to even recognize the threat of the barbarians, thinking that even accepting that these barbarians were causing trouble would weaken their prestige in the public eye.
Generally speaking, after the fall of the Soviet Union "<span>a. ethnic conflicts and separatist movements threatened stability," since there was an immediate collapse in the major power structure that had "tied" the nation together. </span>
Emperors communicated using runners from the capital city of Cuzco.
