In what ways did pastoralists impact farmars (settles people)?

When nomadic pastoralists encroach on farmland their impact can be devastating for farmers. This is especially so on the marginal agricultural land on the frontier zones bordering the deserts. The grazing of herds can quickly reduce plant cover. This makes the soil unstable, and erosion soon follows

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.