<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the "railroad," since rail travel allowed for people and supplies to move to the west at an unprecedented pace. </span></span>
Hey there!
"Which word or phrase describes the native people of Mongolia in the 12th century?"
Well... we could do process of elimination
- It can't be "hunter-gatherers" because they are the members of the nomadic people that who live "chiefly" but by hunting or fishing for certain foods (like wild foods
- It can't be farms because it just doesn't have to do with this portion
- It CAN BE nomadic herdsmen they are basically people who were part of the tribe a particular group that constantly moved from each place to place with/without a indefinite house
- It can't be city-dwellers because they were people who lived in the cities
So, therefore your answer would be: 
Good luck on your assignment and enjoy your day!
~
A small group that breaks away from a larger group is called a splinter party.