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.
Because it didn’t receive support from the senate. Also the U.S wanted to keep America out of European affairs.
They needed to maintain a certain level of strength for "duties".
<span>Your answer is simply Monotheistic</span>
