During this era southerners were against letting slaves be free and many problems and disagreements came with this.
The answer is "wanting to disguise the truth they have uncovered."
Some historians find this tough. One of the reasons would be because not all people may or may not, like the truth. Some historians would omit some part of the truth to keep violent reactions from the readers or outsiders.
Answer:
I'm pretty sure it's with military force.
True.
In fact, Rome was FREAKING HUGE!
https://s-media-cache-ak0.pinimg.com/originals/15/62/f6/1562f68b55b6690b2575941f535d0495.jpg