They flew a bomber to Hiroshima, Japan and dropped a atomic bomb which took out several cities.
1 and 4 are the best choices since The barbarian attacks killed many romans and the Huns sacked hundreds of cities in the Roman Empire and caused chaos. I also believe 4 is another reason for the decline, since the religion started about 400 years before the fall of the empire and sparked many different believes and divided the Empire through religion.
Answer:
highest officer of a state after the governor
Explanation:
