The dividing described here happens inside one person, not across a map. The Most High is a man's own awareness, and the nations are the many states of feeling he can enter, each with its own borders. Poverty has a boundary. So does confidence, so does grief. Awareness parcels out to each state exactly the range of experience that belongs to it.
A person inherits whichever country of feeling he chooses to live in. Step into the state of being wanted, and its whole territory opens, its friends, its ease, its luck. Step into rejection, and life narrows to that nation's fenced ground. The bounds were set by awareness itself, which knows what each mood contains. A man does not fight for a better portion. He moves house, into the state whose inheritance he would rather claim, and its allotted world becomes his own.