Why did later roman emperors have trouble keeping the empire united?

There were lots of rebellions and killings of emperors

Explanation:

many emperors and leaders were killed by assassins and there wasnt a person in power for long enough to truly settle the empire so it eventually fell

The territory was so big that it was hard to rule and enforce laws over

Explanation:

This came directly from actively learn and it said this was correct.

the answer is:

c. economic output

answer; i believe the correct answer is (117);